Mark against the correct answer in each of the following:

Question:

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

$\int \cot ^{-1}\left(\frac{\sin 2 x}{1-\cos 2 x}\right) d x=?$

A. $\frac{-1}{\left(1+x^{2}\right)}+C$

B. $\frac{-1}{\left(1-x^{2}\right)}+C$

C. $\frac{x^{2}}{2}+C$

D. $2 \mathrm{x}^{2}+\mathrm{C}$

Solution:

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