Visual proof of sin(A+B) and cos(A+B) in one picture

[@caitidowns6277]

I spent hours trying to find a more visual, intuitive explanation for the sum and difference identities and couldn't find anything beyond algebraic proofs (which helped a little to show where the identities derived from but did little to elaborate on their relationship to something tangible). Thank you for your video! I never comment on videos but this was such a big help to me and my understanding of this topic. So glad I found this before my exam tomorrow 🙌

[@bruhifysbackup]

Can you please share the algebraic ways you found?

[@sungymungy6930]

I have searched for an intuitive explanation of this concept, and I have to admit, this is very clear and insightful.

[@tachles_math]

I couldn't agree more with u on the understanding part. Good video

[@shivam-kharkhate]

Proof sin(a+b) in unit circle taking (a+b) greater than 90 degree

[@adamsaher348]

Skp to 3:00 if you just want the proof without a lengthy into

[@randomindianguy3048]

I guess I am going to jail for a long time

[@davutselamiozkahraman8200]

Wonderful, easy and fluently proves. Especially I like it because you showed it with using unit circle.

[@zavianwilson6070]

I love this proof... its clear and clean....
its intuitive and insightful...
let me state the obvious for anyone who is as blank as myself... each 90deg is composed of (alpha, beta and gamma)... once you identify any 'single term' in any of the triangle... the other angles are either
a 90deg right angle... or a composition of the two missing terms...
hope I helped someone.

[@Z00711287]

Thanks. One of best explanation

[@the69paradise68]

..... طريقة ممتازة للبرهنة....... وتبدو سهلة لفهم كيف تستنج العلاقات المثلثية لمجموع زاويتين..... اعرف طريقة الجداء السلمي..... وتعلمنا طريقة اخرى...... لكن هذه جميلة جدا...... تعلمت طريقة المستطيل وحساب مساحات... داخل مستطيل.... الانترنات.... سهلت الكثير لمن يريد التعلم...... فكيف يكون الحال مع الذكاء الصناعي......!!!!؟؟؟؟

[@gaurav.raj.mishra]

Keep up the good work. Good luck for your UA-cam career. We really need teachers with the kind of mindset you mentioned at the start of the video.

[@tan1772]

this is a beautiful proof

[@JamesBlacklock]

Excellent!

[@DurgaraoRamakrishnaAdari]

Very nice. In single concept, two proofs are done.

[@GSMusicMusic]

Very clear and very helpful, thank you.

[@SunHail8]

great explanation.

[@АйдарШакиров-х5у]

I am an abituriend from Russia and would like to glad you for this explanation

[@riteshkaran3841]

Nice explanation

[@navindraarjunaabeyesekera7864]

Ingenious

[@Giga_Chad_2281]

its 1am and my brain is fried so quick question why is alpha in the green triangle?

[@joaofelipegueiros3743]

Awesome proof!!!

[@MedTronic73]

nice video good work .... please what is the name of the program you use

[@svojasmathsclassesbyvikass5564]

Beautiful explanation!

[@GyaneshwaranG]

loved your video! very interesting and elegant proof, and very clearly explained!

[@mathproofs4054]

Thanks a lot! Let me know what other theorems might be interesting for you, so that I can cover them in my later videos.

[@imeneeladel6471]

cos (a-b) please :'))

[@sandrokavlashvili8617]

it is very good explanation

[@mrmaths126]

Which software is this????

[@168grhp]

Nice!

[@trevorlim6148]

too good bro too good

[@KevinLuke89]

I think it would help greatly if you could explain why you multiply inner sides to get the outside.

[@TexasHoosier3118]

Excellent video. Thank you.

[@simonwax7575]

Thanks very much for this. Very helpful.

[@pedrodelfino9493]

Keep the good work, great video!

[@ChechoColombia1]

Is this visual representation enough as a proof?

[@___llvm]

Very nice video.

[@coldash7845]

6:37 why is it cosBcosA ?

[@coldash7845]

oh I got it.
you explained in the beginning

[@siapaaja9360]

The radius multiple by cosB and got the adjacent B. Adjacent B = hypotenuse A, times by cosA and got adjacent A.

[@stephensewe4774]

Good and clear presentation. What app did you use here sir, I use geogebra but I can't use only symbols to represent the angles

[@BoZhaoengineering]

Very nice!

[@김충환-b8x]

훌륭한 가르침. 감사합니다.

[@rubybhattacharyamathematic2896]

well explained

[@pbanerjee4008]

great job

[@devilking1366]

Excellent

[@fellipeparreiras4435]

Mind = Blown

[@vishweshpalani1833]

Amazing

[@enterpriserx]

This is great but the real answer is when you look at a problem you see the square and reverse derive all counterrelations and sum or subtract when you need to get. Not for stupid people. Mnemnoics are just fine for

[@888Antoine]

Beautiful work thanks :)

[@vaikunthchaudhari6041]

Thank you sir

[@rnd_penguin]

Very sad to see you post no more,,,, what happened to you?

[@rjsaha93]

THANK U VERY MUCH SIR! !

[@ajmalrashid]

Nice Video Math Proofs.
Very clear and vivid step by step explanation.
Why don't you upload more?
Which software (S) did you use by the way for writing/editing?

[@mathproofs4054]

Thanks a lot! Definitely will. What topics in mathematics interest you? I am planning to add the software used in the description, once I am clear with the legal issues.

[@xd-jy5ex]

thank you bro

[@frankhong6313]

Dude, that criminal/non-criminal comment is hilarious

[@emilyyyyyym]

thank you

[@science-y9209]

👏👏👏👏👏👏👏👏👏👏👏💛

[@AndriiBilous]

чітко! дякую

[@ganeshmishra4062]

Thx

[@cyberjet5946]

Neat!

[@cloudunder1546]

oh i can see!!

[@imeneeladel6471]

very good .great job but if u can do another video to proof cos (a-b) and sin(a-b)then u ll save my life

[@arunakumari3239]

cos(a-b)=cos(a+(-b))
sin(a-b)=sin(a+(-b))
Just use the same formulas but remember that sin(-x)=-sin x and cos(-x)=cos x

[@manny4239]

This is because the teacher doesnt care to take the time to teach this to us

[@alokgupta3006]

I am from India

[@inxeoz]

Total ly green blur😭

[@Aman-br1ph]

Here i found mathematics

[@vighnesh153]

you can work on your graphics more..

[@bruceedward3079]

The proof is hard to understand,

[@mithilaschoolofmathematics]

Just start on blank page by yourself ...by drawing a circle of any radius ...in anticlockwise dir take two Angels Alpha and bitha

[@eetswalads5528]

I only clicked on this video because I didn't have a unit circle handy ;)

[@mithilaschoolofmathematics]

This theorem cab proof by circle of any radius

[@christophersedlak1147]

thanks