Question

Find dy/dx of y=3tan^4x

Answer 1

Apply chain rule.

Answer 2

could you pls help me to solve it :) @Satan 

Answer 3

\[\begin{align*}\frac{dy}{dx}&=3\frac{d}{dx}\left[\tan^4x\right]\\
&=3\left(4\tan^3x\right)\frac{d}{dx}\left[\tan x\right]\\
&=3\left(4\tan^3x\right)\left(\sec^2x\right)\\
&=12\tan^3x\sec^2x\end{align*}\]