JEE Math Practice Question
The value of $$\int\limits_{ - \pi /2}^{\pi /2} {{{{{\cos }^2}x} \over {1 + {3^x}}}} dx$$ is :
- A.$$2\pi $$
- B.$${\pi \over 2}$$
- C.$$4\pi $$
- D.$${\pi \over 4}$$
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