$\int_0^{\pi /2} e^x \sin x \, dx = $

  • A
    $\frac{1}{2}(e^{\pi /2} - 1)$
  • B
    $\frac{1}{2}(e^{\pi /2} + 1)$
  • C
    $\frac{1}{2}(1 - e^{\pi /2})$
  • D
    $2(e^{\pi /2} + 1)$

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