int0^pi dx/(1-2acosx+a^2), alt1 is equal...

`int_0^pi dx/(1-2acosx+a^2), alt1` is equal to (A) `(pialog2)/4` (B) `(4pi)/(2-a^2)` (C) `pi/(1-a^2)` (D) none of these

A

`(pi)/(2(1-a^(2)))`

B

`pi(1-a^(2))`

C

`(pi)/(1-a^(2))`

D

`2pi(1-a^(2))`

Verified by Experts

The correct Answer is:

C

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