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int(0)^(pi//2)(1)/(1+4sin^(2)x)dx=...

`int_(0)^(pi//2)(1)/(1+4sin^(2)x)dx=`

A

`(pi)/(sqrt5)`

B

`(pi)/(2sqrt5)`

C

`(pi)/(2sqrt3)`

D

`(pi)/(2sqrt2)

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