Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{\cos x}{(1+\cos x)} d x=?$

A. $\mathrm{x}+\tan \frac{\mathrm{x}}{2}+\mathrm{C}$

B. $-\mathrm{x}+\tan \frac{\mathrm{x}}{2}+\mathrm{C}$

C. $\mathrm{x}-\tan \frac{\mathrm{x}}{2}+\mathrm{C}$

D. none of these

Solution:

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