Given:





Adding (1) and (2), we get









Here, if f(x) = log (sin x) and f(π – x)=log ( sin (π –x))= log (sin x ) = f(x)





Adding (1) and (2), we get






Let 2x = t 2dx = dt


When x = 0, t = 0 and when x = π /2, t = π






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