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If In=int x^nsqrt(a^2-x^2)dx, prove that...

If `I_n=int x^nsqrt(a^2-x^2)dx,` prove that `I_n=-(x^(n-1)(a^2-x^2)^(3/2))/((n+2))+((n+1))/((n+2))a^2I_(n-2)`

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