Q 1316356270.     Integrate `I= int_{-pi}^{pi} frac{cos ^2 x}{1+a^x}dx`

A

`frac{3 pi}{4}`

B

`frac{pi}{3}`

C

`frac{pi}{2}`

D

`frac{2 pi}{3}`

HINT

By property ` int _{a}^{b} f(x)= int _{a}^{b} f(a+b-x)`
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