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:
