Question

prove the identity from left to right

sin^5x = (1-2cos^2x+cos^4x)sinx

Answer 1

\[\sin^5x= \sin x (\sin ^2 x )^2 \]
\[= \sin x(1-\cos^2 x)^2 \]
\[= \sin x(1- 2\cos ^2 x + \cos^4 x)\]

Answer 2

thank you for helpin! you are sooo pretty!

Answer 3

thats sweet :) Thanks