$\int \frac{dx}{e^x + 1 - 2e^{-x}} = $

  • A
    $\log (e^x - 1) - \log (e^x + 2) + c$
  • B
    $\frac{1}{2}\log (e^x - 1) - \frac{1}{3}\log (e^x + 2) + c$
  • C
    $\frac{1}{3}\log (e^x - 1) - \frac{1}{3}\log (e^x + 2) + c$
  • D
    $\frac{1}{3}\log (e^x - 1) + \frac{1}{3}\log (e^x + 2) + c$

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