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