$\int_{-\pi}^\pi \frac{x \sin x}{1+\cos^2 x} dx =$

  • A
    $\frac{3\pi^2}{4}$
  • B
    $\frac{\pi}{2}+1$
  • C
    $\frac{\pi^2}{4}$
  • D
    $\frac{\pi^2}{2}$

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