$\int_1^2 \frac{1}{x^2} e^{-\frac{1}{x}} \, dx = $

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

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