Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
$\int_{0}^{\pi / 2} \frac{\sin ^{4} x}{\left(\sin ^{4} x+\cos ^{4} x\right)} d x=?$
A. $\frac{\pi}{4}$
B. $\frac{\pi}{2}$
C. 1
D. 0
Solution:
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