Solve this following


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

$\int \frac{\sin 2 x}{\left(\sin ^{4} x+\cos ^{4} x\right)} d x=?$

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

B. $x^{2}+C$

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

D. none of these



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