Mark against the correct answer in each of the following:

Question:

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

$\int \frac{2 x \tan ^{-1} x^{2}}{\left(1+x^{4}\right)} d x=?$

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

B. $2 \tan ^{-1} x^{2}+C$

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

D. none of these

Solution:

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