$\int_0^{\pi / 2} \frac{\pi \sin x}{1+\cos ^2 x} d x$ का मान ज्ञात कीजिए।

  • A
    $\pi^2$
  • B
    $\frac{\pi^2}{2}$
  • C
    $\frac{\pi^2}{4}$
  • D
    $\frac{\pi^2}{6}$

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