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The value of int(0)^(2pi) (xsin^8x)/(sin...

The value of `int_(0)^(2pi) (xsin^8x)/(sin^8x+cos^8x)"dx"` id eaual to :

A

`2pi^2`

B

`2pi^2`

C

`pi^2`

D

`4pi`

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