Question

Find $\frac{dy}{dx}$ if $y=\cos (1-x)$.

Answer 1

Find $\frac{dy}{dx}$ if $y=\cos (1-x)$

$\frac{dy}{dx}=-\sin (1-x)\frac{d}{dx}(1-x)$

$=-\sin (1-x)(-1)$

$=\sin (1-x)$