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

`1//3`

B

`1//4`

C

`1//2`

D

`1//5`

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The correct Answer is:

C

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