Integrand size = 10, antiderivative size = 20 \[ \int \frac {\log (-1+e x)}{x} \, dx=\log (e x) \log (-1+e x)+\operatorname {PolyLog}(2,1-e x) \]
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Time = 0.01 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {2441, 2352} \[ \int \frac {\log (-1+e x)}{x} \, dx=\operatorname {PolyLog}(2,1-e x)+\log (e x) \log (e x-1) \]
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Rule 2352
Rule 2441
Rubi steps \begin{align*} \text {integral}& = \log (e x) \log (-1+e x)-e \int \frac {\log (e x)}{-1+e x} \, dx \\ & = \log (e x) \log (-1+e x)+\text {Li}_2(1-e x) \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00 \[ \int \frac {\log (-1+e x)}{x} \, dx=\log (e x) \log (-1+e x)+\operatorname {PolyLog}(2,1-e x) \]
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Time = 0.10 (sec) , antiderivative size = 17, normalized size of antiderivative = 0.85
method | result | size |
derivativedivides | \(\operatorname {dilog}\left (e x \right )+\ln \left (e x \right ) \ln \left (e x -1\right )\) | \(17\) |
default | \(\operatorname {dilog}\left (e x \right )+\ln \left (e x \right ) \ln \left (e x -1\right )\) | \(17\) |
risch | \(\operatorname {dilog}\left (e x \right )+\ln \left (e x \right ) \ln \left (e x -1\right )\) | \(17\) |
parts | \(\ln \left (e x -1\right ) \ln \left (x \right )-e \left (\frac {\left (\ln \left (x \right )-\ln \left (e x \right )\right ) \ln \left (-e x +1\right )}{e}-\frac {\operatorname {dilog}\left (e x \right )}{e}\right )\) | \(44\) |
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\[ \int \frac {\log (-1+e x)}{x} \, dx=\int { \frac {\log \left (e x - 1\right )}{x} \,d x } \]
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Result contains complex when optimal does not.
Time = 1.94 (sec) , antiderivative size = 60, normalized size of antiderivative = 3.00 \[ \int \frac {\log (-1+e x)}{x} \, dx=\begin {cases} - \operatorname {Li}_{2}\left (e x\right ) & \text {for}\: \frac {1}{\left |{x}\right |} < 1 \wedge \left |{x}\right | < 1 \\i \pi \log {\left (x \right )} - \operatorname {Li}_{2}\left (e x\right ) & \text {for}\: \left |{x}\right | < 1 \\- i \pi \log {\left (\frac {1}{x} \right )} - \operatorname {Li}_{2}\left (e x\right ) & \text {for}\: \frac {1}{\left |{x}\right |} < 1 \\- i \pi {G_{2, 2}^{2, 0}\left (\begin {matrix} & 1, 1 \\0, 0 & \end {matrix} \middle | {x} \right )} + i \pi {G_{2, 2}^{0, 2}\left (\begin {matrix} 1, 1 & \\ & 0, 0 \end {matrix} \middle | {x} \right )} - \operatorname {Li}_{2}\left (e x\right ) & \text {otherwise} \end {cases} \]
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none
Time = 0.20 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.95 \[ \int \frac {\log (-1+e x)}{x} \, dx=\log \left (e x - 1\right ) \log \left (e x\right ) + {\rm Li}_2\left (-e x + 1\right ) \]
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\[ \int \frac {\log (-1+e x)}{x} \, dx=\int { \frac {\log \left (e x - 1\right )}{x} \,d x } \]
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Time = 0.03 (sec) , antiderivative size = 16, normalized size of antiderivative = 0.80 \[ \int \frac {\log (-1+e x)}{x} \, dx={\mathrm {Li}}_{\mathrm {2}}\left (e\,x\right )+\ln \left (e\,x-1\right )\,\ln \left (e\,x\right ) \]
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