$\int e^x \left( \frac{1+\sin x}{1+\cos x} \right) dx =$

  • A
    $e^x \tan \frac{x}{2} + c$
  • B
    $e^x \cot \frac{x}{2} + c$
  • C
    $e^x \cos \frac{x}{2} + c$
  • D
    $e^x \sin \frac{x}{2} + c$

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