Evaluate:.
$\int \cos ^{-1}(\sin x) d x$
Ans. $\left(\frac{\pi \mathrm{X}}{2}-\frac{\mathrm{x}^{2}}{2}+\mathrm{C}\right)$
$=\frac{\pi}{2} x-\frac{x^{2}}{2}+c$
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