$\int \left(1 + \frac{x}{1!} + \frac{x^2}{2!} + \dots \infty \right) dx = $

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

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