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

  • A
    $x \tan \frac{x}{2}+C$
  • B
    $x \sin \frac{x}{2}+\cos \frac{x}{2}+C$
  • C
    $x \tan \frac{x}{2}+\sec \frac{x}{2}+C$
  • D
    $x \sec \frac{x}{2}+\tan \frac{x}{2}+C$

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