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