$\int \frac{dx}{1 + e^x} = $

  • A
    $\log(1 + e^x) + C$
  • B
    $-\log(1 + e^{-x}) + C$
  • C
    $-\log(1 - e^{-x}) + C$
  • D
    $\log(e^{-x} + e^{-2x}) + C$

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