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The value of int(-pi)^(pi)(cos^(2)x)/(1+...

The value of `int_(-pi)^(pi)(cos^(2)x)/(1+a^(x)dx` where agt 0, is

A

`pi/a`

B

`2pi`

C

`api`

D

`pi/2`

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The correct Answer is:
D
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