Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
$\int_{0}^{\pi / 2} \frac{\sqrt{\cot x}}{\sqrt{\cot x}+\sqrt{\tan x}} d x=?$
A. 0
B. $\frac{\pi}{2}$
C. $\frac{\pi}{4}$
D. none of these
Solution:
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