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int(0)^(pi//2) (16sin x. cos x)/(sin^(4)...

`int_(0)^(pi//2) (16sin x. cos x)/(sin^(4) x + cos^(4)x)dx=`

A

`(pi^(2))/(2)`

B

`(pi^(2))/(2)`

C

`pi^(2)`

D

`2pi^(2)`

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