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If I(n)=int x sin^(n)xdx(n in N) and I(n...

If `I_(n)=int x sin^(n)xdx(n in N)` and `I_(n)=(-x sin^(n-1)x cos x)/(n)+(sin^(n)x)/(n^(2))+f(n)I_(n-2)` then the value of `f(n)` is equal to

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