Integral of 1/(e^x + 1) or 1/(e^x - 1)

1. A.
   $\log\left( e^{x} - 1 \right) + x + c$, where c is the constant of integration.
2. B.
   $\ \log\left( e^{x} - 1 \right) - x + c$, where c is the constant of integration.
3. C.
   $\ x - \log\left( e^{x} - 1 \right) + c$, where c is the constant of integration.
4. D.
   $\log\left( e^{x} - 1 \right) - xe^{x} + c$, where c is the constant of integration.

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1. A.
   $\ x + \log\left( e^{x} + 1 \right) + c$, where c is the constant of integration.
2. B.
   $\ x - \log\left( e^{x} + 1 \right) + c$, where c is the constant of integration.
3. C.
   $\ \log\left( e^{x} - 1 \right) + x + c$, where c is the constant of integration.
4. D.
   $\ \log\left( e^{x} - 1 \right) - x + c$, where c is the constant of integration.

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