Question

dy
(b) If y = (cos x)x, then evaluate
dx​

Answer 1

Step-by-step explanation:

We have,

$\frac{dy}{dx} = x. \frac{d}{dx}( \cos(x) ) + \cos(x) . \frac{d}{dx} (x)$

$\implies \frac{dy}{dx} = - x \sin(x) + \cos(x)$