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Prove that int0^a f(x)dx=int0^af(a-x)dx,...

Prove that `int_0^a f(x)dx=int_0^af(a-x)dx`, hence evaluate `int_0^pi(x sin x)/(1+cos^2 x)dx`

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Verified by Experts

The correct Answer is:
`pi^2/4`
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