Question
$\int_0^{\pi /2} {x\cot x\,dx} $ का मान है
खण्डश: समाकलन करने पर,
$[x(\log \sin x)]_0^{\pi /2} - \int_0^{\pi /2} {\log \sin x\,dx} $
$I = - \left( { - \frac{\pi }{2}\log 2} \right) = \frac{\pi }{2}\log 2$.
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