Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
The solution of the $\mathrm{DE} \frac{d y}{d x}=\frac{1-\cos x}{1+\cos x}$ is
A. $y=2 \tan \frac{x}{2}-x+C$
B. $y=\tan \frac{x}{2}-2 x+C$
C. $\mathrm{y}=\tan \mathrm{x}-\mathrm{x}+\mathrm{C}$
D. None of these
Solution:
