$\int_{-\pi / 2}^{\pi / 2} \frac{\cos x}{1+e^{x}} d x$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $0$
  • C
    $-1$
  • D
    \text{આપેલ પૈકી કોઈ નહીં}

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