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int(0)^(pi//2n)(dx)/(1+(tan nx)^(n)) is ...

`int_(0)^(pi//2n)(dx)/(1+(tan nx)^(n))` is equal to `n in N` :

A

`0`

B

`(pi)/(4n)`

C

`(pi)/(2n)`

D

`(pi)/(2)`

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