Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \sin ^{-1}\left(\frac{2 \tan x}{1+\tan ^{2} x}\right) d x=?$
A. $-x^{2}+C$
B. $\mathrm{x}^{2}+\mathrm{C}$
C. $\frac{x^{2}}{2}+C$
D. $2 \mathrm{x}^{2}+\mathrm{C}$
Solution:
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