MathematicsMedium210×since 2002Q3397The value of ∫−π/2π/2cos2x1+3xdx\int\limits_{ - \pi /2}^{\pi /2} {{{{{\cos }^2}x} \over {1 + {3^x}}}} dx−π/2∫π/21+3xcos2xdx is :A2π2\pi2πBπ2{\pi \over 2}2πC4π4\pi4πDπ4{\pi \over 4}4πCheck answerSkip