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The valuye of int(0)^(pi) (dx)/(1-2 a co...

The valuye of `int_(0)^(pi) (dx)/(1-2 a cosx+alpha^(2))` is

A

`(pi)/(1-alpha^(2))` if `alpha gt 1`

B

`(pi)/(alpha^(2)-1)` if `alpha gt 1`

C

`(pi)/(alpha^(2)-1)` if `alpha lt 1`

D

`(pi)/(alpha^(2)-1)` if `alpha lt 1`

Text Solution

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The correct Answer is:
B
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