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Let $f\left ( x \right ) = e ^{-\left |x \right |}$, where $x$ is real. The value of $\dfrac{df}{dx}$ at $x = -1$ is

  1. $-e$
  2. $e$
  3. $\frac{1}{e}$
  4. $\frac{-1}{e}$
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