$\alpha > 0$ के लिए $\int_{-\pi}^{\pi} \frac{\cos^2 x}{1+\alpha^x} \, dx$ का मान है

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

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