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

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

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