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If int(0)^(a) (1)/(1+4x^(2)) dx = pi/8, ...

If `int_(0)^(a) (1)/(1+4x^(2)) dx = pi/8`, then `a= "……."`

A

`(pi)/(2)`

B

`(1)/(2)`

C

`(pi)/(4)`

D

1

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