$\int_0^{\frac{\pi}{2}} x^3 \sin x \, dx =$

  • A
    $\frac{3 \pi^2}{4} - 3 \pi + 6$
  • B
    $\frac{3 \pi^2}{4} + 3 \pi - 6$
  • C
    $\frac{3 \pi^2}{4} + 6$
  • D
    $\frac{3 \pi^2}{4} - 6$

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