Trick for doing trigonometry mentally!

[@juliusnepos6013]

This guy is literally saving millions of people’s future by being better at math

[@lisaninarisahlei2893]

I know.

[@mamellombongo1705]

I don’t get it

[@mutualist2049]

1000% true

[@muzamilahmed6014]

Yes bro😭😭

[@vedantnaikwadi4130]

@@naimakhan2574 😱😱😵😵🦹🦹🦹

[@bootgrip6]

29 year old civil engineering student... never heard of this. This is gold.

[@SkemilArchive]

I KNOW DUDE!

[@kunaljagdale8765]

Haha same here 😂

[@kingmelanin7468]

Same! Best of luck. Also, how bout you sailors let us soldiers win at football?

[@glory6998]

😂😂😂👍👍👍

[@gav-ce5cm]

tell me about your job. is it good. i am interested in engineering

[@kltcbp]

I cried from stressing myself trying to study this for my quiz tomorrow morning, found this video & now I just wanna give you a hug for helping me out. Thank you so much for this video! Keep up the good work!

[@BlueCodesDev]

Do you still remember your comment.now😊

[@FBI-sw3gh]

@Yeet Feet 2 haha yes thats was my ques too

[@vimuth_04]

@kltcbp do u still remember this 😅🤗

[@dr.ienstine1986]

😂

[@joyapaul236]

It's been 4 years..what are you doing now?

[@Unknown-uq2nc]

6 hours till my final, KZbin works in a mysterious ways

[@Faith-gb4kd]

God*. Yes he does

[@rimasdiaa7181]

Make that 17 hours till my 8th grade entrance exam

[@1lovebaking]

@@rimasdiaa7181 did you make it? those are so hard

[@rimasdiaa7181]

@@1lovebaking turns out they gave us a late notification due to the fact they DON'T want us to study, they just want to test my competence so.. yeah

[@1lovebaking]

@@rimasdiaa7181 oop-

[@mohk4837]

SIN=RIGHT COS=LEFT

[@divyabais4911]

very nice

[@absolutemadlad6932]

yes very

[@mvs6592]

Omg u r *sin* !! Thank you. You have *cos* a important comment If u don't understand...Use sin = right and cos = left

[@rmsumali]

That helped

[@Ikiguyy]

@@divyabais4911 Yo why does your picture move when I scroll pass it quite fast?

[@MonkeyGoatLicker]

I know a trick my friend made up. If you are trying to fill in a unit circle for degrees, than say, "30, 15, 15, 30, 30, 15, 15, 30." Until you are done filling it out. It would look like this on the circle: 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270, 300, 315, 330, 360. Keep adding 30 then 15 then 15 then 30 until you get to the end. Hope this helps.

[@husnahabeeb7948]

Pls make a video on this trick🥲

[@gacalka]

What is the end goal in this “trick”? 🤔

[@MonkeyGoatLicker]

@@gacalka this trick is just an easy way to write all of the degrees for the unit circle from 0 to 360. If you fill out the radians of the circle first, then you can see what radian is equal to which degree.

[@gacalka]

@@MonkeyGoatLicker wouldn’t it also be easy to use a calculator then if it’s filling a whole table? Wait, how are the values of the sines, cosines, and tangents of those angles obtained? By use of mind trick or a calculator?

[@MonkeyGoatLicker]

@@gacalka this trick is used to figure the angle numbers. Look up on Google: "The Unit Circle" for a good example. If you want to find sin, cos, and tan then look at coordinates points. Example: (1/2, √3/2) or (0, 1)

[@dhy5342]

So, the Tangent would be the number of fingers on the right of the degree divided by the number of fingers on the left of the degree, and then the square root of that, i.e., the TAN of 60 would be sqrt (3/1); the TAN of 45 would be sqrt (2/2); the TAN of 30 would be sqrt (1/3).

[@smallw2003]

awesome

[@thepro44]

“I’m not the greatest artist” every Four year old disagrees

[@fileenababy06]

😂😂

[@NoActuallyGo-KCUF-Yourself]

I think it would make more sense to number the fingers 0,1,2,3,4 - clockwise for cosine, counterclockwise for sine. Then, just take the square root of that number over 2.

[@baebelieves]

mdiem This makes more sense!!!! 😁👍🏾

[@khumbulanimoyo7106]

Wow ure Soo ryt

[@DrZodaco]

You should make a video probably.

[@sirasilva4961]

Tnx

[@Freefire-f9q3o]

IQ=100000000000000000000000000000000000000000

[@manupasquette4116]

Anyone else look this up for yr11 revision?

[@PyrusDrago16]

Year 10 but yeah

[@CubeyTheGoat]

Ok dont be dissapointed, year 7

[@PyrusDrago16]

Well can someone explain what YR 7 10 or 11 means In my country we use grade like grade 7 is grade 7 = yr 7

[@hritikmorarji1103]

@@PyrusDrago16 Bruh we not talking bout grades,we talked about what year we are in so u are in year 11 then you are in yr 11

[@philaryswift]

@@PyrusDrago16 year 10 means the grade u study in. So if u r 15 years old, you would be in year 10 (for u u call it grade 10)

[@taelongx]

"Handy little trick" xD

[@abdulshakoornooralam7835]

k dramA FAN? ME TOOOOOO YOUR PROFILE ITS THE POSTER OF THE K DRAMA SCARLET HART REYO!!! MOON LOVERS !!!1

[@reatleatmcpagani4997]

come on dude dont be a pussy writing things that dont matter.its commonplace to be one with nature

[@amywhitehurst105]

Wish I could dislike a comment just for the cringe

[@shinigami4440]

Quite handy

[@pakivines459]

Well, you can

[@barnsey_4173]

He sounds like a flight attendant omg

[@sheepleslayer586]

With a stuffy nose. Haha

[@random_dude2362]

Stop using obscene language

[@PyntepicRobloxVids]

Why are you crying tho

[@evan.5967]

Sloogle He’s an overreactive hooman that uses emojis too often

[@yashraj5080]

Set the speed slow

[@keving1774]

2:00 sin is on the left side of the hand then, you switch it two sin is on the right instead of the left side of the hand

[@R3_dacted0]

This saves me so much time.... I always draw out two triangles and solve it that way. Nice trick!

[@peterbohus2629]

Amazing! I know them perfectly for my exam tomorrow! Thank you so so much

[@nazninsultana8204]

What kind of sorcery is this!!! Where were you my whole life?

[@erickerick8610]

There are several ways to make things easier. You could remember the Sin() values in order from Sin(0) to Sin(90) as sqrt(x/4) with x varied from 0 to 4, then the Cos() would be the same values but invert their order. Afterwards Tan() is just solving Sin()/Cos(). Another way is to visualize rows for Sin() and Cos(), Sin() on top, with 30, 45 and 60 degrees as columns, then fill it left to right starting from top left "1,2,3, 3,2,1 ", divide everything by 2 and the numerators get a sqrt except for the ones with 1. You won't get values for 0 or 90 degrees but those are easy if you understand what Sin() and Cos() are on the trig circle.

[@muhammadsahil9535]

40 % saying thank or he is god 30% talking about his voice 30% is talking about 45* finger

[@senj28]

Muhammad Sahil ☝️

[@powerofroses1670]

I think you are right. It's the bad apple at the end of the spectrum disorder such as autistic ppl or with special needs. 🤭🤭🤭

[@sportckhighlights6260]

These percentages are wrong. There should be a percentage of those who commented about other comments😏

[@syedali.1193]

It's good video. ....

[@michaelcrabbe4269]

loooollll

[@MoonlightGlimmer]

Dat hand on fleek tho

[@jeniferaguilar234]

lol !

[@realgirl5055]

Moonlight Glimmer I'm dead.😂😂😂😂😂 can't stop laughing. Omg!! somebody helllp!!

[@CandidDate]

Or you could memorize the values.

[@sofialol6951]

HAHAHAHA

[@t.sh786]

🤣🤣🤣🤣🤣💔💔💔

[@dyetaa]

Lmao,this appeared in my recommended just as i ve finished my trigonometry homework

[@Muhammad_Waleed]

It's creepy 😨

[@jiminbang5822]

@@Muhammad_Waleed it's youtube

[@Muhammad_Waleed]

@@jiminbang5822 Once I just talked about Money Hiest with my Friend I haven't even watched it..... But I randomly got 2,3 Videos about Money Hiest reviews in my Recommendations. Lol ✌️

[@jiminbang5822]

@@Muhammad_Waleed dundundun

[@smahane5664]

what if I don't have 5 fingers :)

[@jodexcreates]

Use your toes

[@smahane5664]

+Jodex what if I don't have toes :)

[@jodexcreates]

Then use whatever you used to reply to my comment.

[@aa-theone]

A smart phone? Then Positive yes would be disqualified!

[@jodexcreates]

A A Oh well...his loss, he better buy a damn calculator.

[@anjumshabana287]

It's a great trick, I'll improve it a bit before explaining to my students .Thanks for giving the idea.

[@russellcampbell3639]

You got the last one reversed. It was 45°, so it didn't matter, but you went left for sin and right for cos.

[@lampy4485]

at first i was so confused still a saw the answers were the same

[@williampennjr.4448]

Just switch hands.

[@kaijumpz1496]

Russell Campbell I

[@sportckhighlights6260]

You get how the method works which means he did his job. 😂

[@ksd1685]

I'm studying for A/L's these days. This looks like a nice 'handy little trick', but I feel like remembering those values is better and simpler 😅 Anyway this is useful indeed when we're forgotten any of those values.

[@Aiden-xn6wo]

I agree, just remembering the values are much easier and more meaningful.

[@joeyenniss9099]

FYI this does the whole circle, this is just the first quadrant. Only thing that changes is the signs (+ or -). If the x values are negative then the cosine is negative, and if the y values are negative than sine is negative. So figure out the quadrant and slap on the right negatives and you can do any angle not just up to 90.

[@joeyenniss9099]

​@kipskip_1203 yes it is the same other than the sign. You can put it in you calculator to double check if you need. Supplementary angles will always give you the same sin and cos just with a different sign ( + or - ) depending on the quadrant the angle ends in. For 135 degrees it is in the second quadrant so the cos will be negative because the x axis is negative, but the sin will stay the same because it is the same positive y value. 225 degrees will return the same value as well, but both sin and cos will be negative because the x and y values are negative in the bottom left quadrant.

[@isenewotheophilus6485]

@@joeyenniss9099 A Smart Trig Class (all-1st, sin-2nd, tan-3rd, cos-4th)

[@loismathius8747]

I love this guy he use smart way to teach Math. His English sounds like Australian yet a lot easy for me I really want to talk to him one day.

[@icxndzn]

The videos from 6 years ago still work

[@bluewitch2769]

PUG IT!

[@ivymayer]

This is pure gold, I can’t thank you enough 🙌🏼

[@andreoka]

Wish i knew this back in high school, would have made things so much easier...

[@ELIZABETHOkiwelu-fh4qi]

This trick is unbelievable! It has cleared all my doubts of never being able to learn this topic. Thank you sir.

[@leenmaher2641]

My life before and after this video is not the same. Huge thank you !

[@FluidMatters]

Handy trick ;) But still better to remember 1-1-sqrt(2) and 1-2-sqrt(3) right angle triangles. The physical meanings of sin, cos and tan are built into this triangle method, which is what you need to USE trig. Is this too standard to be worth a video?

[@linasrain7977]

Where was this when I was failing my math exam two years ago

[@jemimahjokthan2066]

9 years later still helping a lot....

[@solerest4955]

Thank you! This makes my pre-calculus final tomorrow moderately less stressful! :D

[@MrChesemis]

Thanks dude, studying for pre-cal before school starts in a few days... this is a life saver

[@gwensimmons_gigi1629]

Yes like the left hand trick for Sine. Love this one also, but it’s more like the 9 times multiplication table trick which uses both hands. Math rocks!! Tfs! 😘✨👍🏾

[@abhimanyubabu9776]

I was in a real worry about thinking these sin, cos and tan but today it had faded awy. Thanks a lot sir, from bottom of my heart🥺❤️🙏

[@dilipkhednah]

Damn. Wish a was taught this way during my school days in the 80s. Maths teachers never taught anything like this. Oh,how times have changed.

[@ok-xk2rr]

They don't teach like this still

[@omaraziz5408]

@@ok-xk2rr my teacher taught me that. I am in an international school

[@dantripps9695]

That is an incredibly “handy” trick! I wish I had known of it back in… 1985. :) THANKS!

[@aljebraschool]

Well detailed lecture. I've just started my maths KZbin channel and hope to learn from you on how to grow it

[@astrobere]

you saved my life on maths🎉🎉🎉 super hero

[@german131211]

i love math again thank u so much

[@MashupMath]

+german cahuantzi Agreed! This was an awesome lesson. I've never seen this strategy used for trig.

[@ARKIO-so3pi]

just wow. Mind truly blown. This trick is living rent free in my head now.

[@Corey-pn1vv]

As an university student that's studying math, I owe you my life

[@brashowarper4249]

Nice, a very good trick to have on hand.

[@tecmath]

Dad joke. I love it!

[@linkmaster959]

I just try to remember that cos(30) = sqrt(3)/2 is the distance on the x axis and has to be larger than cos(60) = 1/2 since 30 degrees is closer to 0 degrees and cos(0)=1

[@antoniomax37]

Even after 8 years. This is still Gold Thanks a lot❤❤❤❤❤❤❤❤❤❤

[@aloysius260500]

You sir just saved an engineering student.

[@user-zu7xk9ki6f]

cos = left, sin = right just remember 'cosine' cause that's got them in the right order (even though that isn't what it means)

[@liamexter]

Poor people with polydactyly :(

[@horace.e6110]

i dont see what the problem is just cut it off lmao

[@sdaries8339]

@Trimplum14 im fine

[@sybilknight]

In the last example, you change the sides to which you assign the sin and cos. In the first two examples sin is to the right and cos to the left, in the last example you switch them when you explain it, but I think that happened because you use 45 degrees, so the answer is the same for sin and cos.

[@sathyastanley782]

RIP people without hands lmao don't cancel me it's a joke guys

[@MI-lo2hj]

🤣🤣😂theres always that one guy

[@hazelreys1103]

Saving this for my MCAT. For some dumb reason we can't use calculators so I'm going back to the basics of learning things without one.

[@lisaninarisahlei2893]

I wanna say thank you for this absolute content. saving me from tons of memorizations. just little petty mistke but got it though.

[@livlovelife18]

THANK YOU!! This is a Godsend for my maths non calc gcse tmr!!

[@saikarthikreddy1603]

Who all didn't understand

[@DaniDy01]

You're on your own buddy

[@notsurefornow69]

Do you understand now

[@notsurefornow69]

​@@DaniDy01u doing gcses bro?

[@DaniDy01]

@@notsurefornow69 what does gcses mean

[@notsurefornow69]

@@DaniDy01 nvm

[@BlairBalagot]

I cant believe that i passed high school without learning much about trigonometry

[@georgemissailidis7581]

“So going from left or right we will name the angles...” *goes right to left*

[@Senseigainz]

Hes from Australia (accent) so everything is inverted. 🙃

[@kanishkasharma9877]

Hats off to this guy

[@danfrancisco8209]

havent even watched just heard "gday" and now im subscribed

[@Jee2025nitc]

I am watching this third time to remind the trick. This is awesome trick... Thank you

[@lucasm.3864]

Great, now I need all of my fingers! Math eludes me once again.

[@soomiij]

0:30 i was waiting for the “i’m not an artist” 😭

[@visakhm.s3235]

awesome trick. I wish I knew this earlier...

[@MATHSTechy]

Visakh M.S For now tricks join Maths Techy Watch videos once

[@privateaccount4460]

End points are easy, pi/4 is sqrt(2)/2 on both x&y, if you're close to the x axis your x is sqrt(3)/2, y is 1/2. If not close to x, points are inverted. find out signs from quadrant location

[@fendiy3948]

thanks m8 it is very helpful

[@MeCatlock]

I wanna be a engineer for A.I and you need to know trigonometry and this helped thx

[@Adzz7x]

This dude has confused me beyond belief

[@thakur2203]

If you really want to learn you should visit www.udemy.com/trignometery-for-any-competitive-exam-based-on-academics/?couponCode=HURRYGRAB10.this course is for free but limited offer

[@petrinabasi912]

you're confused? i am too

[@sukuna6812]

You're not alone

[@noah-battlegroundsmobileindia]

😂

[@areesha3386]

😂😂😂

[@ggsani1972]

Thank You!!!

[@samm4510]

I prefer the equilateral triangle with length 2 and splitting in half to find the values

[@gr1nder07]

Sam M side length 2 or altitude of 2?

[@samm4510]

gr1nder07 Side length 2 giving a perpendicular height of root 3.

[@SuperFerdie1965]

Doesn't work for 45 degrees though.

[@M4thnet]

Excellent. Simple way. Very inspiring. Thank you.

[@JohnJohnningJohnson]

"Oh my..I do say! That hand does appear to be flipping us off, sir."

[@dinot-rex3524]

I want to thank KZbin for recommending this needful video❤️💕

[@rasheedoladex1385]

Thanks ,cause is like my daughter we be the best in class now

[@ishratjahanriya3208]

you literally saved my trigonometry exam!!!!!!! 🤯🤯🤯🤯🤯

[@always5809]

So you’re telling me this has existed while I’ve been memorizing trig triangles for my whole life

[@noorharoun8431]

I saw the thumbnail of this video and I'm freaking outttttttt 😭😍. I love you

[@jinishvasani6959]

thanks sir

[@MATHSTechy]

RANDOM GAMING If u want more maths trick.. Subscribe Maths Techy

[@JoelJospeh]

for those who didn't get 45 degre one. root2/2 =root2/root2 x root2 =1/ root2 hope now u got it now :D

[@TruptiHundiwala-qu9wi]

Trick is good but voice is not clear. Thank you.

[@SaqibAli-sr5lq]

Trupti Hundiwala I agreed

[@shaunaklavande8159]

bruh i love his voice

[@maskedbusiness2080]

was wrong mite

[@243WW]

Ozzie

[@leohknee]

He’s Australian...

[@adinax]

Omg tyyy! you don't know how much your channel is easing my stress 😢

[@erinrose1097]

This is like effort, I just remember the exact values triangles

[@mailguru17]

I can solve in few seconds-calculus n Trig-problems-done with hard work-tuitioned by Sir-had phobia of Coaches

[@UnSanitary]

Where can i buy one of these?

[@captainobvious.29yearsago70]

what? hands? idk, dark web I guess

[@UnSanitary]

@@captainobvious.29yearsago70 I kid you not i have NO memory of writing this comment lol. No idea how wasted i must have been.

[@mohammadtila7746]

his voice is bloody lovely .

[@65FM1Edits]

You sound like the shark off of Finding Nemo

[@formalPirateClips]

Handy little trick indeed 🙌🏻

[@euqhoriandrea]

I see what you did there 😏

[@haider4899]

i wish i knew this earlier :I

[@riptideone4161]

candh same

[@josephwilkinson173]

Simplest trick yet so effective - Life saver :)

[@francoischoffel46]

I spent 30 years of my life designing metal structures, I never needed these values.

[@gnamp]

When showing the sine and cosine of 45 you counted the fingers to the left for sine and those to the right for cosine. Not that it matters, because they’re the same for that angle but some consistency would have been nice for keeping confusion at bay.

[@georgeburdine5660]

Was he flipping me off, no, just on a tangent.

[@willie_mccoy]

You win. Nice.

[@jcanet1555]

Thank you for existing

[@thabanichagi2790]

At school,they taught us that the Sin and Cos of 45 degrees is 1/2 with the denomenator square rooted....now i don't get it when he says it's 2/2 with the numerator square rooted although it makes sense with his hand trick.

[@samuelzonenshein1437]

Thabani Chagi ya I don’t get that either. Although it makes sense it’s wrong

[@uchiha1wert866]

it's because you need to rationalize it that's why i turned into 2/2

[@alanmesfin]

Don't worry, both, what you were taught and his answer, are the same number just written differently.

[@wareesha3734]

Either rationalize it OR as 2=√2*√2, write this in the denominator and it cancels the √2 in the numerator so you're left with 1/√2

[@2346drcool]

This may be the best math trick I’ve ever learned! This will make my life so much easier in precalc lol

[@qin2500]

wtf this is to op, they need to nerf it or something

[@danielraymond7196]

Nah this doesn't work anymore, it's been patched

[@elliepepler7473]

you're actually a life saver

[@STEPPAdonn]

What if I have more than 5 fingers😓

[@selenator4life499]

Tajay Campbell Use a calculator then.

[@angrysound2490]

u can cut others finger😂

[@ajmartin942]

Take off your shoe.

[@Hamzakhan-op7yh]

God has not made any thing useless. Bro I u can do finger tricks like no other or other techniques.

[@boadiciaturner5875]

Well your special

[@gav-ce5cm]

I was born with this tool