Trigonometry Concepts - Don't Memorize! Visualize!

A trigonometry introduction, overview and review including trig functions, cartesian quadrants, angle measurement in degrees and radians, the Unit Circle and the Pythagorean Theorem.
UPDATE: I have posted a longer multi-part trig series! Please see the Introductory video here: • TR-00: Introduction to...
The playlist is here: • TR - Trigonometry Seri...
Thanks for your patience!
Timestamps for this video:
00:00 Introduction
00:36 1. The Six Trigonometric Functions
09:35 2. Cartesian Coordinates and Quadrants
11:24 3. Angle Measurement in Degrees and Radians
19:34 4. The Pythagorean Theorem
20:44 5. The Unit Circle
International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11

[@jessar82]

Sir, you are a legend and hero in the eyes of every student who watched your video after spending years living in fear of the trig and the unit circle.

[@DennisDavisEdu]

What a nice thing to say! I'm glad you found it helpful.

[@amgsworld2617]

Absolutely!

[@KRBhaidoomer1]

@@DennisDavisEdu Really precious scenes♥️

[@WyMustIGo]

@@DennisDavisEdu Now if only someone can teach these young WOKE fools that only two genders exist, and that thinking otherwise means you're an idiot.

[@lalilali5782]

ONG 😤

[@ricetown9981]

This man has confirmed my belief that if you are telling your students to memorize concepts, you do not understand them yourself and should not be teaching them.

[@CharlesIsabirye]

Agreed

[@jdoesmath2065]

I've been teaching mathematics for 32 years. This is simply the best introduction to Trig I've ever seen. I did not hesitate to share this with my Precalculus students. Thank you.

[@rul1175]

I needed to read this; I'm about to take pre calc in college and I wasn't sure if this will be part of the class.

[@CharlesIsabirye]

Indeed you are one in a million 🙂

[@louvaniste]

NEVER in my life (and I am 75) have the fundamentals of trigonometry be shown to me in such a clear manner. Thank you so much ! Greetings from Belgium, Patrick WOUTERS.

[@Aboody92]

same here

[@ExtrovertedCenobite]

And yet you made it to 75 just fine without seeing it in a clear manner.

[@ronnfoxx8472]

i said the same thing

[@tedpatriot2963]

@@ExtrovertedCenobite yah but imagine had he learned this in his teens he could have conquered the world!

[@ExtrovertedCenobite]

@@tedpatriot2963 I know of many who have mastered many fields and have not conquered the world.

[@thepastarat]

After 3 separate trig classes, this is the first time I've actually intuitively understood how the unit circle works, and haven't needed to memorize things to get through tests and assignments. I wish all math teachers would teach as clearly and concisely as you do.

[@mohinderkumar7298]

90% are incompetent

[@ullasrajchellappan1]

Only if they themselves knew what they are teaching. Many are teaching from rot memory.

[@coolsywhutatops3768]

omg, so this is what they mean that math is easy as long as you really understand it. every explanation has explanation holyshit feels good

[@TheAstriapo]

"I'll never use this in my lifetime, so why do I need it?" Me, in 1986. Fast forward to 2008, used the 3,4,5 method to check a wall to see if it was square. I think I saw it on This Old House, lol. Use it all the time now. I use angles every day as a carpenter. I try to keep learning, so in the mornings, I watch how-to videos. I love math. I love the look and design of the math equations and every day I learn something. Thank you for the visuals. That is a huge help.

[@simpleman283]

As a carpenter I used the 3,4,5 for nearly 8 years till an electrician friend taught me the Pythagorean Theorem. That opened up a lot for me, but when I started learning this trig stuff on youtube I really felt like a fool. My teachers were so bad in school, I never got past pre-algebra. Anyway here is link to a 8 minute video I thing you would enjoy. kzbin.info/www/bejne/eqTJZ3R6rK9pbKc I found it in the comment section.

[@TheAstriapo]

@@simpleman283 That video is pure poetry. Wow!! Amazing. My schooling was the same, but I always loved math and physics. There is a mystery there and I'd love to figure it out. lol if that makes any sense.

[@stxrynn]

I took trig my first semester in college. Six years later, I went back to college to finish up. In my Calculus class, they ran a quick quiz the first day. It said I had a 30% chance of passing. A friend came over for supper that night and he drew out this information for me. I posted it above my work desk. It made all the difference! I very nearly got an A that semester in Calc 1. Visualization and memorization can work together to make you a master of this information.

[@nokalamaduna2709]

Best trigonometry class that I have ever sat in, man, we were never taught like this at all, it's like our teachers never wanted us to understand this concept or maybe they never understood it themselves in the first place so we're doomed. Long live Sir Davis.😊😊

[@aquarius4953]

Or maybe they said the same thing but you didn’t listen to them.

[@mikemondano3624]

Just an intro. Spherical trigonometry will be on the test.

[@theunusual7631]

@@aquarius4953 Or maybe the teacher had explain it, but in a complex way that the students are confused.

[@qaiser648]

@@aquarius4953 nah

[@Lluks4]

@@aquarius4953 you sound like a frustrated teacher

[@marioalbertocasanovaguio4271]

Mr Davis I’m a medical doctor, which always been interested in mathematics physics calculus and such, my late father was an engineer maybe that is why I’m interested in this. For what I remember when I was in high school I was never been explained this concepts as you are doing here, now I’m hooked to this Trig series as a high school kid It’s always fantastic to learn something new, but it’s even better to perfectly understand the concepts the way you explain them Thanks a lot!!! Wish we had internet and KZbin when I was a kid

[@shisir_nayak2377]

Videos like these are the reason I watch KZbin.

[@buttonmasherbaberkins7490]

THIS. IS. BEAUTIFUL!!! The applied mathematics approach is the only real way for many of us to learn. These basic foundations really help improve my CMM and GD&T knowledge. I'm SO happy to have found this series and cannot wait to jump into the Statistics course before taking my Six Sigma exam. Thank you so much for taking your time to do this and I hope that your channel grows so that we have more resources like this! You and TheOrganicChemistyTutor are changing the game!

[@DennisDavisEdu]

Thank you very much ButtonMasher! I'm glad you find my videos helpful and your kind words mean a lot to me.

[@hamzatalib1551]

​@@DennisDavisEdu​ I must say so too, I'm impressed and very thankful. Just started 10th, and very afraid of trigonometry, and u cleared the whole chapter for me before my teachers even got to try. Even if they do, they would just drag on the chapter for 2 weeks where all the students would be told to memorize everything, but in just half an hour, you cleared the whole chapter without telling me to memorize anything, u definitely earned a subscriber

[@ChacingBugs]

I went from having almost zero knowledge of what trigonometry is to having an incredibly intuitive understanding. Thank you.

[@rpruneau68]

Wait til you experience Trig Identities

[@joaomane4831]

It's incredibly easy. I don't know what about it trips people up. It's literally memorizing formulas and algebraic manipulations of said formulas.@@rpruneau68

[@TheZectorian]

when teachers say memorize this it is so annoying, because ideally you should memorize very little; everything else should follow naturally from what little you did memorize

[@handoor]

FLASH CARD/CHARTS/FORMULAS TIME STAMPS 5:43 trig functions (SOHCAHTOA) 7:39 trig functions (reciprocals) 11:18 quadrants (Cartesian Plane) 14:49 chart (Radians) 20:13 formula (Pythagorean Theorem) 24:42 3 numbers (Unit Circle) I saved your trigonometry course and I will try to finish it. Despite some of the math I will study would not be use in my daily life someday. I still would love to be enlighten and enjoy learning with it.

[@JeremyMcElhone]

Thank you for the time stamps! Very helpful. :)

[@tuneboyz5634]

@@JeremyMcElhonegood luck for your exams lil Jeremy :)

[@wowodys]

I swear my teachers just show how to solve problems, NOT how to understand them, and understanding is the basis of higher maths. Thank you so much for this video. It helped alot and is an incredible source of knowledge and understanding.

[@Z1ng123]

First time - I understand this on a visual matter. Instead of learning formules without knowing what I was learning. I agree with another respons that you should have 1M views for this YT video.

[@dominicestebanrice7460]

This video is a masterpiece! It deserves to be running on continuous loop in the Metropolitan Museum of Art.

[@JoeTartaglia-Malter]

Mr Davis, Thank you for making this so clear in this step by step "unit by unit" manner. You present each concept to the viewer as if they have little to no understanding, and tip-toe through each. Absolutely fantastic. Please keep your videos coming.

[@kenechukwuchime4780]

This is the first time I’m commenting on a KZbin lecture video and that’s cos I’m beyond wowed. This is hands down the best lecture I’ve had in my life. Thank you! 🙏🏽

[@pook4386]

The best explanation I've seen on KZbin by far. I wish I saw this before my trig class started!

[@nopopshots2722]

Watching this video solidifies in my mind, just how much time was wasted going to school. I was stuck in Trig for 4 years, never understood it as well as I have now in this short 30 minute video. I appreciate what you're doing to help accelerate our up-and-coming generation. I just hope it isn't too late.

[@proage5139]

The way you are able to see patterns and explaining them really helps me with understanding this. Thank you!

[@MathSciMadeSimple]

Words can’t describe how this video helped me understand the concept of trig functions further. Thanks a ton!

[@Jonathan-Hunt]

This is the first time I’m commenting on a KZbin lecture video and that’s cos I’m beyond wowed. This is hands down the best lecture I’ve had in my life. Thank you!

[@theena]

Daniel, I wish I could take this video back in time 20 years. You made me understand what took me over 24 months back in high school to memorize so I could pass an exam, and you did it in five minutes.

[@fyler1]

I've been out of high school for 19 years, and I stumbled upon this video. I am still absolutely blown away by mathematics and the relations of numbers to each other. Thank you for this lesson.

[@mattkriese7170]

This was a great supplementing tool for a lot of what I learned in Precalculus so far! No more drawing out unit circles for me! Visualizing Pythagorean theorem also never occurred to me before. I'm excited to put this all into practice and save some time. Big ups! 🙌🏻

[@4everThoughtful]

You, Mr Davis, Sir, are an absolute genius! You are able to teach a not-so-easy and intimidating concept to make is as easy reading a road map by using its legends!! I'll gladly pay to join your Trigonometry classes (probably other math classes, too). Thank you, thank and thank you again!!

[@DennisDavisEdu]

Thank you so much, I think I'm blushing!

[@calvertwilliamson4721]

@@DennisDavisEdu You have what many instructors lack which is the ability to teach knowledge to others. Thanks for sharing, but I would purchase a course from you.

[@pdjibril]

I agree 100%

[@Amplifymaths]

Sir excellent.. Which software are you using?

[@Squash101]

You have no idea how much you have helped me. I'm taking a fast paced TRIG class in college and haven't done trig since junior year in HS and was completely lost until this. The course is suppose to cover all of trig in 5 weeks :/

[@Desktopped]

the last part with the small, medium, large is a big help. That is really easy to remember and use. I was struggling with trig when they appear on graphing problem in class, now I feel like I can solve them on my own. Thank you very much!

[@narenderyadav5729]

the perfect tone, perfect pace and perfect representation.....thanks for this simplified tutorial

[@flaneurable]

I didn't think you'd make it but you came through. You got me over a difficult hurdle.

[@jayt675]

Highly recommend. You will never have to memorize the Unit circle again. Brilliant way to teach. Thank you very much.

[@sucdilucky3795]

But I still try to memorize it 😩

[@jayt675]

@@sucdilucky3795 try it a few times. it might help.

[@DennisDavisEdu]

There's not as much to memorize in trig as you might think. If you understand the concepts, you can figure out most things quickly and with less stress than memorizing. And you enhance your understanding!

[@jayt675]

@@DennisDavisEdu Yes, agreed. After I watched your video a few times, I started to understand the concepts.

[@stevenmarley3654]

3 Years later, and you're still saving lives with these videos! THANK YOU!

[@TheTwigz19]

I'm studying for my FE exam and never in my life have I ever understood trig this well. I wish these sorts of videos existed years ago when I struggled with math in high school through college. I love the concept of visualizing because I'm a visual person and most teachers don't teach that way. I felt like I always needed to memorize things I didn't even understand completely because I could not see it in my head. From the explanation of a radian, and seeing how and what it is and showing us the break down of the degrees vs the radians to the unit circle explanation was the best! I remember in one of my math classes I would spend forever either memorizing the unit circle or squeezing it into a corner on my cheat sheet lol. I always wanted to know the whys and teachers don't usually teach the whys or show us how we got certain values such as the ones on the unit circle. I'm looking forward to learning from more of your videos.

[@ImmigrantSuccess]

I’m an English as a second language teacher. I love these memory hacks. It helps to give first time learners edge of confidence that they could learn further. Truly the heart of a teacher.

[@yms7887]

Thank you! This video is incredible. Not only it demystified trigonometry but now I actually understand. Like someone else mentioned, this is "Gold Standard" teaching.

[@StopWhining491]

Thanks for continuing to say "don't memorize." As you say, knowing how to derive the details makes this SO much easier.

[@Dagoth_Ur_1]

You're a very good teacher. Text books and school teachers are pretty horrendous at explaining more complex maths topics, you break it down step by step so anyone can understand and remember (visually) thank you.

[@Weedwacker112]

This golden content, keep it up! With this single video (and without taking notes) I fully understand the concepts you have explained just by watching this video once! This is amazing, this deserves tons of appreciation. Keep it up!

[@DennisDavisEdu]

Wow, thanks! You gave me a boost for the day!

[@Weedwacker112]

@@DennisDavisEdu Your welcome, keep up the great content!

[@markbarton8872]

Dennis, I'm 62 and this was my introduction to trigonometry. I failed algebra 1-2 and never made it to trig or calc. I grew up in a family of engineers. I used your pattern technique to memorize my multiplication tables. Couldn't remember the individual combinations of numbers but I could round things to fives and tens, extremely quickly. Your cheat isn't original but you're the first person I've ever met that taught math that way, Thank you. I went into the field of horticulture, plants. Landscaping, particularly the Japanese garden, fascinated me. It is a universally loved form of art in my field. Geometry is my native mathematical language in my head, All I see is patterns. Turns out the Japanese Gardens magic is tied up in endless triangles. Once you can visually dissect the design all you can see is the triangles. Somehow they figured out how to landscape in trigonometry. Countless acquaintances have told me I would have loved trigonometry. I would have. Thank you for tying a lifetime of interest together into one handy bow. Mark Barton

[@DennisDavisEdu]

What a nice story, Mark, thanks for sharing!

[@SoloRenegade]

excellent! these are the same sorts of tricks I came up with to avoid memorizing things too. It's not laziness, it's about being practical. I recognized in high School that I would never remember everything forever, and that the less I had to memorize, the more likely I would remember it long term, and focused instead on being able to use those basic core concepts to recreate or solve for anything else I needed later on. I didn't learn the concept of "first principles" until well over a decade later in life, but that's basically what we came up with.

[@storyspeak777]

Oh my God! I hadn't expected this video to happen. It has helped me with a mountain of exercises since I was in 12 grade, a junior high school, I had learned Physics in general, and trigonometry in particular. At that time, I was stuck by the death circle, 'cause I couldn't remember the numbers well. But when I watched Dennis Davis's video, I completely changed my mindset to the Trig. It's easier to have a deep understanding, and, of course, Davis I'm now always visualizing not memorizing as you said! Anyway, Thank you so much for making an incredible video!

[@yayisavedzelda]

This is such a phenomenally informative video. The visualizations make trig easy to learn. I am very pleased with this quality content.

[@jybinu]

Sir you are amazing. You have demystified trigonometry in 30 mins. I must say that I am now in love with trigonometry. Sine, cos and tan have now their own personalities. They are tangible and very much useable. I wish calculus and imaginay numbers could also be conceived like this.

[@presto709]

Excellent. I love your emphasis on knowing how to visualize things rather than memorizing.

[@saltysnoopy]

You channel was simply listed on my youtube screen. I took trig in HS and one course in college. It's always intrigued me. As a sailor using celestial navigation I should be very familiar with it. I also have a book on spherical trig ... wow, a little over my head, but that's what navigation is based on. I hope to learn a lot from your channel.

[@paisleyreid5878]

after years of my life spent not understanding trig, this video finally made it click. i’m a visual learner and have a hard time with math because of this, but your teaching style makes it so much simpler to understand! THANK YOU!

[@DennisDavisEdu]

I'm a visual learner too Paisley. I'm creating videos I wish I could have seen when I was in school. I often thought "If only someone would have explained it this way I would have understood much better!" So that's what I'm trying to do! I'm glad you found it useful. I've just posted a full trig course that goes into more detail and follows the same graphical teaching style. Happy learning!

[@Ixions]

11:35 imo, this would have been a good spot to shoehorn the "right hand rule" in as a memory aid for the direction that the angle sweeps positive as that is also a very fundamental concept much later. "Just point your right thumb at yourself and notice the direction your fingers curl". This will also address any potential ingrained mental bias towards clockwise motion.

[@angbcastro]

Wow, this was amazing. The calm voice, clear explanations and easy rules of thumb. Awesome!

[@slavenpenava5413]

Thank you for this comprehensive and very simple visualization of trigonometry, was struggling with it for my CS uni prep but now I think I can ace this section of the entry exam, THANK YOU VERY MUCH!

[@MegaSquiff]

Excellent stuff!… I can appreciate the sheer number of hours it must have taken to produce this. Subscribed!

[@MasayaShida]

Thank you so much for this. 13:14 I never was taught that, instead I was taught to remember some formula on how to convert form rad to degrees but never got an explanation why

[@gregsuarez5205]

I wish I knew you when I took trig in high school. Very helpful and would have helped immensely. Thank you so much for sharing. Thumbs up and subscribed. 30 years later, I find I’m having to relearn forgotten math needed for new job role. Thanks again for providing clarity on this

[@fernandoadrianromeroalvare2612]

Dennis, thank you a lot for this video. Wish I had been taught trig like this many years ago, everything was laid out so clearly!. You're an excellent teacher, greetings from Buenos Aires - Argentina.

[@marktahu2932]

Hey Dennis - Where were you 55 years ago, when instruction like this would've changed my life! I am so jealous of the Kids these days with their access to Instructors like you and the clarity of that instruction. Now I'm using this to catch up, review and explore so many new and exiting fields of interest. Thank you so much.

[@DennisDavisEdu]

Thank you Mark for those kind words. It's never too late to learn something new! I agree with you: Today anybody can learn anything they want for free. Not at all like when we were kids.

[@75blackviking]

I know what you mean. I scour youtube for content like this. It's pure gold.

[@lukinitza5650]

Thank you for the high quality lesson! It helped a lot!

[@johnosullivan-nq2wd]

This is the most visual-spacial / logical step by step explanation that every student needs. This is exemplary.

[@jaketan5172]

This video integrates trigonometric math basics taught in many schools in separate lessons of segmented syllabus in ways that paralysed young learners - paralysis by analysis. It is great as an introduction video before and after trigonometric classes. IT serves as a beautiful 'end in mind' learning outcome that both teachers and learners can relate to, work towards and achieve together.😊

[@anotherday-anotherslay]

This was more helpful than my last 3 math teachers. *Thank you.*

[@raychi871]

Thank you. Now I can flex my math skills in trig this new school year when Im taking trig

[@otaviolicht]

Simply brilliant! Clear, systemic and direct. Congratulations

[@franke1917]

Thank you so much! You really made it so simple, I wish i had teachers who could explain at lest half of how well you explained here. You are just excellent.

[@dna1238]

Excellent method of teaching , should be the " Gold Standard "

[@AynRand1967]

Agree

[@refreshist4821]

Should be the standard

[@chromiedoodles]

Excellent presentation. I never had Geometry and was homeschooled and now I'm in college trig. This tutorial is a lifesaver and better now than never although I wish I'd seen it 2 weeks ago before class started. Appreciate you creating this content and look forward to watching your other vids.

[@mikemondano3624]

Yeah, "homeschooled" means you'll be behind for the rest of your life. Sad, really.

[@isaacmalik3714]

homeschooled lol

[@glasssmirror2314]

I salute you sir.No teacher has specified those xy coordinates as you did.They just draw the circle and give those figures.

[@tomdempsey3600]

Realised a very similar thing a year after intro to unit circle. BY FAR the best way to understand trig

[@whatswithme]

Best video ever. Sir, you're an absolute legend. I'll rewatch this video many times from now on. I could understand in two days a topic that I was so afraid of for months. I'm actually in precalculus and I this has saved my life. Thank you, sir. I'll watch your other content and subscribe! Hope you continue being a math hero! 👏🙌

[@DennisDavisEdu]

Thank you Manuel for your kind words. I think my big Trig series (see description for link) is so much better than this video, but this one gets all the views and nice comments. That series has 80 videos right now, but every day this long-form overview video gets more views than those 80 combined. Well, the customer is always right! Thanks again, I'm glad you were able to overcome your fears. A little knowledge can give confidence, and confidence fights away the fear!

[@MagnomRock]

very underrated, very good content. keep up the good work!

[@jakeanderson7203]

Unreal. Days spent memorizing, because that’s what the teacher told us to do. But it’s this easy. Watching this one time gave me a better understanding of trig than all my years of school. Thank you.

[@stargasm1000]

I'm 50 years old and I back in high school, I had to repeat Algebra so, I never had trigonometry. I really wish I did because I think this is a fascinating subject. Good thing for KZbin and videos like this made by someone who knows and can explain the subject, to make it possible. Great video!!

[@akui_senpai8158]

This deserves millions of views. My teachers told me to cram T-raios without explaining what they actually are, and that's where this becomes annoying. Thank you very much for providing such a great video learning by visualisation and understanding can make anything easier.

[@mikemondano3624]

T-raios are my favorite cereal. A little milk and sugar and Great!

[@bob-ny6kn]

Why, when there is so much more to life than videos repeating grade school classes?

[@basavaraj1684]

Well my math teacher at school does the same.

[@rbd104]

I am an artist and have been intimidated by math all my life. This makes at least the introduction to trig manageable. Thank you for explaining it in such a visual and clear way.

[@rampakeshbharat1938]

Mathematics cannot intimidated anyone, ones' mindset to the subject is the issue...

[@glenmartin2437]

Thank you. Took trig as a jogh school junior. It helped me to understand construction and also ballistics used by the US Marines and sailors

[@aimanbryan1424]

This is by far THE BEST explanation on Trigonometry I have ever seen in my life!

[@giannemarie972]

Gonna comment to boost the algorithm. One of the best math vids out there. Thank You!

[@ravindrabhilare8282]

Thank you! Why you stopped making more??? Your teaching is just amazing... you should go ahead ... you will rock!! (:

[@chekiek8444]

Good sir you are a blessing I've been avoiding trigonometry for more than a year because of the unit circle, but you taught it to me so easily i can not sufficiently express my gratitude to you good sir THANK YOU VERY MUCH

[@AB-et6nj]

Very helpful because it's thorough and complete in its discussion, explaining everything and leaving almost nothing for granted. If only everybody approached things in this way (not just for mathematics) by analytically capturing the set of all things to be explained

[@jonathanxdoe]

Why this guy has only 125 subscribers?! Really brief, clean and complete explanation!

[@robertoteran5442]

probably because he has only two videos. why woud someone subscribe to an account with no more content

[@DennisDavisEdu]

I have posted more videos now.

[@jonathanxdoe]

@@DennisDavisEdu glad to hear that!

[@HSA-]

The basics of Trig are no longer a conundrum. This video is an absolute GEM 💎

[@georgesadler7830]

Professor Davis, thank you for a solid explanation of the classic Trigonometric Concepts in old fashion Mathematics.

[@tascrphs]

Just a stunningly great tutorial. So many kids in 99% of high school literally quit school, because poorly taught math courses like Trig rips their soul. This should have 1 billion views. Your video should be a pre-requisite for ALL middle and high school math teachers, and ALL Freshmen college students. Seriously!!

[@justcore69]

This video on trigonometry turned out to be the most understandable and informative of all that I have seen before. I did not even notice how 30 minutes of the lesson had passed, while I was absorbing the information with interest

[@jledford5644]

I was only taught the sin, cos and tangent. While I knew about the other three, I was never introduced to or used them. Thank you for a most informative class!

[@jandejongh]

Me too, and happy with it. Why introduce yet another function name for say 1/sin(x)? For me sin, cos and tan, their series expansions, the complex exponential and Euler's identity are all trig I bother to remember.

[@jamesnasmith984]

Upon completing grade 13 trig I doubt that these concepts were this clear in my mind. An art, good teaching.

[@arxaaron]

Enlightening little video. Very direct path to understanding and translating the relationships of of the trig functions to angle and radeon values. Thanks!

[@steves5172]

You have my respect! I am 70 years old and I wish my math teacher had shown your methods, we were always being told to memorise, memorise, memorise! Can’t beat a little brain exercise!!!! Thank you very much!

[@DennisDavisEdu]

An ounce of understanding is worth a pound of memorizing!

[@xjam879]

If I had watched this in high school, I probably would’ve Aced the class! The visuals are excellent. Thanks again! 👍

[@Valadez14]

You did a fantastic job explaining everything! Thank you very much for all the work you put into the video it helped a lot!!!

[@DennisDavisEdu]

Thank you Valadez, you lifted my spirits for the day!

[@ArthurHess]

Thank you so much, Mr. Davis! After seeing the pattern for converting degrees into radians, I decided to use multiples of 15 degrees (pi/12 rad). I could go even further and use multiples of 5 degrees (pi/36 rad). This is amazing, thanks for explaining it so clearly!

[@williamthompson2866]

Wow. This video would have saved me so much time in high school. Thank you for taking the time to teach everyone in such way that is easy to remember! This is making my return to math for college much easier!

[@GoatzAreEpic]

Thanks I never knee the sin and cos were derived from soh cah toa, where hypp = 1 so it can be ignored. Very cool thank you! Just memorizing 1 circle = 2π radians :)

[@DennisDavisEdu]

My new trig series has been posted... kzbin.info/www/bejne/hHOmZY2seNllgsk It is a series of 46 mini-lectures with (I think) improved style and clarity. It is more in-depth than this simple overview. Dennis

[@DeionBonner]

Is this still essential or should I skip this and start there?

[@DennisDavisEdu]

The series won't be completed for some time, but it is much more in-depth. This one covers the essentials, but I had to leave some stuff out, like the most famous equation in trig: cos²θ +sin²θ = 1. For quick overview, stay here, for more in-depth, see the series. Or watch 'em all!

[@DeionBonner]

@@DennisDavisEdu Decided to watch both 🤷🏾‍♂️

[@suyapajimenez516]

I’m kind of loving this channel. TVM professor David

[@Sebb-hc1il]

What would I do without you?

[@troybush5899]

Very well presented! Excellent use of GRAPHICS and COLORS...and GREAT VOICE, too. THANK YOU 🙂

[@nparekh79]

Respected Sir... This video should be made mandatory for all students studying Trigonometry and even Complex Numbers !! You explained it very well. There should be a separate award for teachers who can teach complicated Mathematical concepts so easily. I am sure you would win every year. Thank you for your efforts !!

[@47.FortySeven.47]

Whithout Visualisation this gave me a Headache.. Now are you here to give me Nightmares !! 😂😂😂

[@dallascowboys1683]

I graduated in 90’ and I had trig my freshman year and this’s exactly how my teacher taught us. I loved math!

[@amberferrell1840]

AI engineering student: Thank you for breaking that down in simplest terms- you've made a significant improvement in my comprehension of the unit circle and what exactly the trig functions are and what they mean. I truly appreciate this knowledge- it definitely beats trying to memorize like a fool. I crave to comprehend always.

[@stevennunn]

Brilliant video! Supremely straight forward! Thanks a lot!