मान लीजिए $f(x) = \int_{\sin x}^{\cos x} e^{-t^2} dt$. तो $f^{\prime}\left(\frac{\pi}{4}\right)$ का मान ज्ञात कीजिए।

  • A
    $\sqrt{1/e}$
  • B
    $-\sqrt{2/e}$
  • C
    $\sqrt{2/e}$
  • D
    $-\sqrt{1/e}$

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