$\int \sqrt{1 + \sin \frac{x}{2}} \, dx = $

  • A
    $4\left( \cos \frac{x}{4} - \sin \frac{x}{4} \right) + c$
  • B
    $-4\left( \cos \frac{x}{4} + \sin \frac{x}{4} \right) + c$
  • C
    $4\left( \sin \frac{x}{4} - \cos \frac{x}{4} \right) + c$
  • D
    $4\left( \sin \frac{x}{4} + \cos \frac{x}{4} \right) + c$

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