Proving Trigonometric Identities | ExamSolutions

[@AvenFurness]

14 years later and this is still saving people! thank you! :)

[@kingpin2760]

As clear as it can be with this guy videos

[@goshtin]

Is there any sort of strategy for the direction and method you use? I always find myself going in completely the wrong direction. for example, I probably would have multiplied the denominator out and ended up confusing the whole question. Do you have a sort of.. order/method you follow for deciding what to do at each step?

[@allroundlad]

If you have 2 separate fractions trying to be proven as a single fraction, it's wise to combine the 2 separate fraction into a single fraction first.

[@adlinsasi6485]

Super idea surely I will win this exam

[@sadmanzaid420]

No strategy just practice it for better pattern recognition when doing such problems.

[@Sharl360]

I'm from Jamaica and I just want to thank you for these helpful tutorials...You are one of the reasons why I am more confident doing maths. Nuff Respect!!!!

[@ExamSolutions_Maths]

I need a guinness

[@ExamSolutions_Maths]

@xxwhyamistillsingle Its an identity symbol. An identity is true for alll values whereas an equals sign is true for only a small range of values.

[@luwamalem9537]

Okay, so I kinda understand it but , at the same time I'm sat there thinking wth is this??

[@ExamSolutions_Maths]

@FIy019 Thanks - more coming very soon

[@ExamSolutions_Maths]

No probs. Pleased to hear that you found it useful

[@CreepypastaHorror]

Very helpful but I'm still fucked lol

[@revitsaini5012]

Erick Alden ha ha true same here

[@mohamedalinajib6333]

plese dont curse. its not very nice.

[@thecouncil8973]

Erick Alden hahahaha

[@taniam2377]

Erick Alden mood

[@remariorichards8237]

thank you so much. your videos are really helpful and advocative!

[@ExamSolutions_Maths]

You're welcome.

[@ExamSolutions_Maths]

Thanks and all the best for tomorrow.

[@ExamSolutions_Maths]

@boxoflols There are more - have you been on the website and looked under identities from the main index page?

[@finn14lake]

Oh my goodness how do you write so neat with that pen tool? I can't even write that neat with a regular pencil!!!

[@MsBubblesAye]

Looove your accent and the way you make such hard topics easy

[@Avia1998]

Hey I'm from Trinidad you lessons are the bombdiggity :) I have add math finals tomorrow and this helped me a lot !

[@ExamSolutions_Maths]

Thanks

[@lazaruswillson6868]

COOL!!! but when it comes to solving equations i've no freaking idea!

[@Edgaro]

Love this channel

[@ExamSolutions_Maths]

@YdLeet Pleasure Pleased to hear you found it helpful

[@pastelhowell6419]

further maths exam today, thank you for saving my life

[@clementbaird6082]

awesome video. i'm from Guyana this was more than help full thank you.

[@ExamSolutions_Maths]

Good to know I am reaching Guyana. Thank you.

[@MrGuardsec]

Nice tutorial.. i learned thanks .. my finals exam for Trigonometry is Tomorrow hope it went well :)

[@KarateYaaaLol]

thank you! ive been finding this quite hard in maths

[@sosteph86]

TY!! quiz tomorrow and this was the most helpful video! i hope i make an A ;)

[@MrWill2ways]

Thank you so much for the clear explanation.

[@ulovemeandihateu]

Thank you! This helped me understand better

[@ben1st1]

Amazing!!! Thanks!

[@samiollah112]

Can you perhaps show me how to solve this : cos2x*sin2x=0 (for interval 0

[@neesam.1610]

I have 28 questions to hand up on Monday! you just saved my life

[@8eyeee]

So did you solve them all?

[@yijunfeng4027]

this is really helpful, thank you so much

[@ExamSolutions_Maths]

@TheAbc1234567 In the UK this is covered for A-level. (age 17-18)

[@ExamSolutions_Maths]

Wow, it's good to reach out to Jamaica. All the best from snowy England

[@shenmagbanua5575]

kinda grasp the idea already omg thanks for the help

[@ExamSolutions_Maths]

🙂

[@njabulovilakazi2337]

You're Simply The Best! How I wish I were like you!

[@ExamSolutions_Maths]

It is (1+cosA)(1+cosA) since it is squared. So expand the brackets in the usual way.

[@Abuabdurrahman]

fisrtly i'd like to thank you ever so much but i have a few queries: -do you think you can upload the missing topics in the C3 module of ocr please please mainly : •"Inverse trigonometric functions"** •The exponential function •The reciprocal function 1/x •Numerical Integration - Simpson's Rule

[@ExamSolutions_Maths]

Not necessarily this one but similar ones.

[@ExamSolutions_Maths]

Well done.

[@RShahProductions]

Maybe late now but for C4 this gent does exams with video solutions... check them out they are key!! I wouldn't have got an A in C2 without them!!! If you don't want to do past papers you can even just go to your unit's page, look at the topic and the end will say "questions on XYZ"

[@satishbadugu5776]

THANK YOU because this video is really helpful to me

[@alexasteele8549]

We have an exam today. Thank you sir. :))

[@ExamSolutions_Maths]

That's good.

[@MoneyAndPeople]

Thank you for this.. and fyi grades in U.S. are = Grades in U.K. - 1 So Grade 13 in the UK - 1 = 12th grade in the U.S. We go to school 13 years though... we call what you call Grade 1, kindergarten

[@bananaellingford]

Thanks so much. Your dull monotone voice allways helps me get to sleep.

[@ExamSolutions_Maths]

No problem - sweet dreams

[@jduniverse4961]

Dickhead

[@coumarinmicamica2367]

Help a lot man. Thanks!

[@christopherroylan2937]

thanksss , it really helps me alot.

[@raychellennicolependon7000]

Thank you! 😃

[@k2d10tode11]

i will probably understand after i watch it over a 1000 times! lol. thanks!

[@xYakyuBaka]

Thank you very very much for these, my teacher didn't teach us all the units in time and i'm finding this really helpful as the chapters are difficult to learn just from the text book. I'm still worried about it a bit though just as my exam is very soon and i don't know if i'll be able to learn it that fast (teacher said she would fit it in at the last minute but didn't). I was wondering if you know if questions on identities come up a lot and how much marks they would probably be worth?

[@YdLeet]

Thank you!

[@jefe5507]

Please do more of this

[@ciel0mae028]

Thank You verrryyyy much. It helped me a lot. ((: Thanks for taking ur timeee & elaborating this things clearly. :)

[@shweetii247]

thank you so much for this. you're awesome!

[@maryamtahir92]

this helped a lot!

[@dogeeatsveggies]

sir.. im s bit confused at the part where you said in 2+2 (cos A), 2 is a common factor that is why it became 2 ( 1 + cosA )? but all in all.. i did understand it.. very good job sir.. thank you so much :)

[@ExamSolutions_Maths]

Good luck!

[@inkster]

thank you. i found that your accent makes it more interesting and easier to pay attention, haha.

[@GazedDzn]

Also from Jamaica helping me with my Add. math

[@xJackalope]

nicee

[@Drie237]

Wouldn’t mind paying to have access to these videos.. whatever grade I get next August man it’s all you🙏🏾

[@ExamSolutions_Maths]

Thanks, a donation always helps with the running costs, always appreciated. www.examsolutions.net/donation/

[@yuserneim]

What software do you use for making the videos?

[@seangonzales8729]

Tyvm Sir.

[@ExamSolutions_Maths]

@inkster I'ver never been told that before

[@ExamSolutions_Maths]

good

[@gojosensei9475]

plz make the video on making prove that sums easier

[@TheZadzzz]

thank you very much, and you sound a lot like NICOLAS CAGE ;)

[@saumyadip11]

Truly, its really helpful. :D

[@ExamSolutions_Maths]

Good luck

[@iliapopovich]

Excellent.

[@007audioslave]

thanx nice video

[@NewOrleansboii]

Even if you expand the bracket in the denominator, SinACosA will just equal 1.

[@weedandwater]

How do you write so neatly with your mouse?

[@sweetiestars4529]

problem solving using (a+b) identities

[@ExamSolutions_Maths]

Cool!

[@ExamSolutions_Maths]

@xEquals3x Cheers

[@Abuabdurrahman]

(continued from previous commment) run out of words] These are the ones i struggle with and they coincidentally are not uploaded yet i would be greatful ESPECIALLY THE ONE WITH THE ASTERISK(*) because i just don't understand from all revision books i believe only you could help me understand since you have so many times before.

[@ExamSolutions_Maths]

Hope it went well.

[@tjdj10]

Thanks a lot for the video but I have a question when you divided both the denominators together to get the new denominator can you also cross multiply to get the new numerator?

[@thomasbrown5763]

yes

[@584emad]

given that tita=2/3 so find the value of cos using your calculator , can u please tell me how to do it?

[@gottfried-o8k]

Is proving trig identities required for engineering? Or should I just them as a tool?

[@studywithzar]

what did you use to create your video? :)

[@mahendrakarki960]

Thank alot

[@ExamSolutions_Maths]

Pleasure

[@ExamSolutions_Maths]

@MrWill2ways Pleasure

[@PigPredator]

omg thanks so much

[@jefe5507]

Please do more

[@TheAbc1234567]

For which grade is this lesson?

[@akshaybabu3378]

thanks sir

[@liliaelkhatib7766]

Your voice resembles paul McCartney's

[@ExamSolutions_Maths]

I like that!

[@TheVaselineboy]

im confused at 3:40 when you say "now we'll expand these brackets" "1 times 1 = 1" ("1 times cos A = cos A") so what i don't understand is why, well how you multiplied by the number "1". On your problem all I see is ("1+cos A") not " ("1 (times) cos A")........

[@MrBlooms101]

genius!

[@Thomasianwood]

Why would you have sin2 A agian please explain and cos2 A??

[@dk_9512]

nice video

[@ExamSolutions_Maths]

@coombemedia12e4 Will try.

[@K4MR4N1UK123]

Why did you not just cancel the top fraction by the bottom denominator before expanding the brackets stage?

[@bengeary4740]

That would give you the question at the start so you would make no progress

[@lemodon13]

how do you get that 2 cos

[@alexyuto6629]

(1+cosA)^2 is equivalent to (1+cosA)(1+cosA). Expand (1+cosA)(1+cosA) = 1 + cosA + cosA + cos^2A = 1 + 2cosA + cos^2A

[@ExamSolutions_Maths]

Welcome to

[@panic5198]

plz help to solve "prove that sinA-sin3A/sin^2A - cos^2A=2sinA"

[@gojosensei9475]

that how can we solve all question without any difficulty