$\int \left[ \log (1+\cos x) - x \tan \left( \frac{x}{2} \right) \right] dx =$

  • A
    $x \log |x| + c$
  • B
    $x \log |1+\sin x| + c$
  • C
    $x \log \left| \tan \frac{x}{2} \right| + c$
  • D
    $x \log |1+\cos x| + c$

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