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

B

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

C

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

D

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

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