यदि $\int(1+x-x^{-1}) e^{x+x^{-1}} dx = f(x)+c$ है, तो $f(1)-f(-1)=$

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

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