Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
$\int_{0}^{\pi / 2} x \cos x d x=?$
A. $\frac{\pi}{2}$
B. $\left(\frac{\pi}{2}-1\right)$
C. $\left(\frac{\pi}{2}+1\right)$
D. none of these
Solution:
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