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

IP 4

Find $\int \frac{\mathrm{e}^x}{\mathrm{e}^x + 1} \mathrm{d}x$.

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Answer:$\ln(e^x+1)+C$

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