Find the integrals of the functions $\frac{1-\cos x}{1+\cos x}$

Question

$\begin{array}{1 1} 2\tan \frac{x}{2}-x+c. \\ 2\tan \frac{x}{2}+x+c \\ 2\cot \frac{x}{2}-x+c \\ 2\cot \frac{x}{2}+x+c. \end{array}$