Find the integrals of the functions $\tan^4x$

Question

$\begin{array}{1 1} \frac{1}{3} \tan^3x-\tan x+x+c \\ \frac{1}{3} \tan^3x+\tan x+x+c. \\ \frac{1}{3} \tan^3x-\tan x-x+c. \\ \frac{1}{3} \tan^3x+\tan x-x+c.\end{array}$