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

  • A
    $-2 \sqrt{2} \cos (\frac{\alpha}{2}) + c$
  • B
    $2 \sqrt{2} \cos (\frac{\alpha}{2}) + c$
  • C
    $\sqrt{2} \cos (\frac{\alpha}{2}) + c$
  • D
    $-\sqrt{2} \cos (\frac{\alpha}{2}) + c$

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