Mark against the correct answer in the following:
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:

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