$\int_{ - \pi /4}^{\pi /2} {{e^{ - x}}\sin x\,dx} = $

  • A
    $ - \frac{1}{2}{e^{ - \pi /2}}$
  • B
    $ - \frac{{\sqrt 2 }}{2}{e^{ - \pi /4}}$
  • C
    $ - \sqrt 2 ({e^{ - \pi /4}} + {e^{ - \pi /4}})$
  • D
    $0$

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