Question

Solve: $\frac{d}{dx}\left({\tan }^{2}x\right)=$_______ .

Answer 1

$\frac{d}{dx}\left({\tan }^{2}x\right)$

$=\frac{d}{dx}\left({\tan }^{2}x\right)\frac{d}{dx}\left(\tan x\right)$ {Using Chain Rule}

$=2\tan x{\sec }^{2}x$