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## Homework Equations

integral 0 to pi/2 ((cos^n)x dx),

integral 0 to pi/2 ((sin^m)x dx),

integral 0 to pi/2 ((sin^m)x * (cos^n)x dx),

condition: when m,n odd; m,n even , m even n odd n so on...

## The Attempt at a Solution

ans hints:

(m-1)/(m+n) * (m-3)/(m+n-2) .............