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

  • A
    $\frac{\pi^2}{2}$
  • B
    $\frac{\pi^2}{3}$
  • C
    $\pi^2$
  • D
    $\frac{\pi^2}{4}$

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