Mark against the correct answer in each of the following:

Question:

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

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

A. $x^{2}+C$

B. $-\mathrm{x}^{2}+\mathrm{C}$

C. $\frac{1}{\sqrt{1+x^{2}}}+C$

D. $\frac{1}{\sqrt{1-x^{2}}}+C$

Solution:

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