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int(pi//8)^(3pi//8)(cosx)/((cosx+sinx))d...

`int_(pi//8)^(3pi//8)(cosx)/((cosx+sinx))dx=(pi)/(8)`

Text Solution

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Apply, `int_(a)^(b)f(x)dx=int_(a)^(b)f(a+b-x)dx`.
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