$\int_{-\pi}^{\pi} \frac{\cos^2 x}{1 + a^x} dx, a > 0$ નું મૂલ્ય શું છે?

  • A
    $\pi$
  • B
    $a\pi$
  • C
    $\frac{\pi}{2}$
  • D
    $2\pi$

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