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सिद्ध कीजिए की int(0)^(pi//2) log cos ...

सिद्ध कीजिए की
`int_(0)^(pi//2) log cos x dx = int_(0)^(pi//2) log_(e) (sin x) dx = -pi/2 log 2` अथवा `pi/2 "log" 1/2`,

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