If int(0)^(k) ( 1)/(9x^(2) + 1) dx = ( p...

If `int_(0)^(k) ( 1)/(9x^(2) + 1) dx = ( pi )/( 12)` , then k is equal to

A

`(pi)/(4)`

B

`(1)/(3)`

C

3

D

none of these

Verified by Experts

The correct Answer is:

B

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