समाकलन $\int \limits_{-\pi / 2}^{\pi / 2} \frac{d x}{\left(1+e^{x}\right)\left(\sin ^{6} x+\cos ^{6} x\right)}$ का मान ज्ञात कीजिए।

  • A
    $2 \pi$
  • B
    $0$
  • C
    $\frac{\pi}{4}$
  • D
    $\frac{\pi}{2}$

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