Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \frac{d x}{(1+\cos x)}=?$
A. $\frac{1}{2} \tan \frac{x}{2}+C$
B. $-\cot \frac{x}{2}+C$
C. $\tan \frac{x}{2}+C$
D. none of these
Solution:
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