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Walli's Formula

\(\int\limits_0^{{\pi\over2}}{\sin^m x\cos ^n xdx={{[(m-1)(m-3)..................2or1][(n-1)(n-3)...............2or1]}\over {[(m+n)(m+n-2).................2or1]}}}\)

Multiply the above result by \frac{\pi}{2} only when both n and m are even (treat o as even).

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