PreCalculus - Trigonometry: Trig Identities (30 of 57) Proof sin^2(x)=(1-cos2x)/2

In this video I will prove sin^2(x)=(1-cos2x)/2.

[evertonoliveira]

I'm brazilian and I hadn't found any video or material good enough to learn it, fortunately you helped me, thanks a lot!!

[TheJoey]

I should have locked in these identities back in high school precalculus. Now I'm somewhat struggling with 2nd semester calculus.

[yeonhojung]

Thanks Michel! Always helping me so much

[abhishekkarole]

thank you sir ! thats was great help for me i was wondering around 1 hour for that explaintion I Am huge confused for that freaking formula thank Q Sir May God Bless You

[jhiny]

A very helpful and great video. Thank you, from Brazil.

[espenmyrset]

Thank you! This was a good explenation

[cricketwithvivek]

Sir sin^2x/2 formula in cos pls tell me

[rhysthomas]

How do you get from sin^2 x to 1-cos2x/2 ??

[harpreetsinghhoney]

cos x + cos 2x +...+cos nx =cos (n+1/2×x) sin (nx/2) cos ( x/2) prove it

[anis-ld]

wow
i never thought i would watch math
for

[mygoal]

I got stuck on this one. Integrate tan^2(x)sin^4(x)