\[ \int \frac{\cos x}{(1+\cos x)} d x=? \] \( \mathrm{P} \) (a) \( ...

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\[
\int \frac{\cos x}{(1+\cos x)} d x=?
\]
\( \mathrm{P} \)
(a) \( x+\tan \frac{x}{2}+C \)
(b) \( -x+\tan \frac{x}{2}+C \)
W
(c) \( x-\tan \frac{x}{2}+C \)
(d) none of these
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