$\int {e^{x/2}} \sin \left( \frac{x}{2} + \frac{\pi}{4} \right) \, dx = $

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

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