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For 0 lt alt 1 ,the value of the integra...

For `0 lt alt 1` ,the value of the integral `int_(0)^( pi)(dx)/(1-2a cos x+a^(2))` is:

A

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

B

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

C

`(pi^2)/([pi+a^(2))`

D

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

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