$\int \frac{x + \sin x}{1 + \cos x} dx =$

  • A
    $\log_{e} (1 + \cos x) + c$
  • B
    $x \sin^{2} \frac{x}{2} + c$
  • C
    $\tan \frac{x}{2} + c$
  • D
    $x \tan \frac{x}{2} + c$

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