$\int_0^{2 \pi} \frac{x \cos x}{1+\cos x} d x=$

  • A
    $\frac{\pi}{6}$
  • B
    $\pi^2$
  • C
    $\frac{\pi}{4}$
  • D
    उपरोक्त में से कोई नहीं।

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