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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

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