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Prove that int(0)^(a)(x)dx = int(0)^(a) ...

Prove that `int_(0)^(a)(x)dx = int_(0)^(a) f(a-x)dx` and hence evaluate `int_(0)^(pi/4)log (1 + tan x)dx`.

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The correct Answer is:
`pi/8 log 2`
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