reduction formula for (sinx)^m (cosx)^n with limits 0 to pi/2

reduction formula for (sinx)^m (cosx)^n with limits 0 to pi/2
in the numerator start off with (m-1) , (n-1) subtract 2 successively till 2 or 1 is reached
in the denominator start off with (m+n) , subtract 2 successively till 2 or 1 is reached

Also put a pi/2 in the numerator if m and n are both even


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