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int(0)^(b) (dx)/(1+x^2)= int(b)^(oo) (dx...

`int_(0)^(b) (dx)/(1+x^2)= int_(b)^(oo) (dx)/(1+x^2)`, then b is equal to

A

`tan^(-1) ((1)/(3))`

B

`(sqrt3)/(2)`

C

`sqrt2`

D

1

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The correct Answer is:
D
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