Techniques of Integration - Logarithmic Integrals of \(\frac{f'(x)}{f(x)}\)

Techniques of Integration - Logarithmic Integrals of \(\frac{f'(x)}{f(x)}\)

\(\displaystyle\displaystyle \displaystyle\int{\frac{1}{1+{{\mathrm{e}}^{-x}}}\,\,\mathrm{d}x}\)

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Answer:\(\ln \left| {{\text{e}}^{x}}+1 \right|+C\)

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