$\int_{-\pi / 2}^{\pi / 2} \frac{\cos ^{2} x}{1+3^{x}} d x$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{4}$
  • B
    $4 \pi$
  • C
    $\frac{\pi}{2}$
  • D
    $2 \pi$

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