is-the-formulla-of-sin-3-pi-2-x-cos-3-x-correct-

Question Number 97132 by student work last updated on 06/Jun/20

is the formulla of \sin^{3} (\frac{π}{2} + x) = \cos^{3} x correct ?

Commented by student work last updated on 06/Jun/20

ans me

Answered by Ar Brandon last updated on 06/Jun/20

\sin (\frac{π}{2} + x) = \sin (\frac{π}{2} - x) = cosx

thus \sin^{3} (\frac{π}{2} + x) = \cos^{3} x

Commented by student work last updated on 06/Jun/20

thanks