Question

Find $\frac{dy}{dx}$.

If $y=\cos (1-x)$.

Answer 1

$y=\cos (1-x)$

Differentiating w.r.t. x, we get,

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

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