The value of $\int\limits_{ - \pi /2}^{\pi /2} {{{{{\cos }^2}x} \over {1 + {3^x}}}} dx$ is : - DASH

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Question

The value of $\int\limits_{ - \pi /2}^{\pi /2} {{{{{\cos }^2}x} \over {1 + {3^x}}}} dx$ is :

$2\pi $

${\pi \over 2}$

$4\pi $

${\pi \over 4}$

Solution

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