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Integrating Reciprocated Exponential Function!

Calculus Level 2

$\large \int \dfrac1{1 + e^{-x}} \, dx = \, ?$

Clarification: $C$ denotes the arbitrary constant of integration.

\ln(1 - e^{-x}) + C

\ln(1 - e^x) + C

\ln(1 + e^x) + C

\ln(1 + e^{-x}) + C

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by Kirubel Solomon

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