$0 < a < 1$ માટે,સંકલન $\int_0^\pi \frac{d x}{1-2 a \cos x+a^2}$ ની કિંમત શોધો.

  • A
    $\frac{\pi^2}{\pi+a^2}$
  • B
    $\frac{\pi^2}{\pi-a^2}$
  • C
    $\frac{\pi}{1-a^2}$
  • D
    $\frac{\pi}{1+a^2}$

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