Question

if y=tanx.cotx
dy/dx=?​

Answer 1

$y = \tan(x) \times \cot(x) \\ \\ y = \tan(x) \times \frac{1}{ \tan(x) } \\ \\ y = 1 \\ \\ \frac{dy}{dx} = \frac{d(1)}{dx} \\ \\ \frac{dy}{dx} = 0$

Hope it helps.