Integrand size = 10, antiderivative size = 29 \[ \int \frac {\log (x)}{a+b x} \, dx=\frac {\log (x) \log \left (1+\frac {b x}{a}\right )}{b}+\frac {\operatorname {PolyLog}\left (2,-\frac {b x}{a}\right )}{b} \]
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Time = 0.02 (sec) , antiderivative size = 29, 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 = {2354, 2438} \[ \int \frac {\log (x)}{a+b x} \, dx=\frac {\operatorname {PolyLog}\left (2,-\frac {b x}{a}\right )}{b}+\frac {\log (x) \log \left (\frac {b x}{a}+1\right )}{b} \]
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Rule 2354
Rule 2438
Rubi steps \begin{align*} \text {integral}& = \frac {\log (x) \log \left (1+\frac {b x}{a}\right )}{b}-\frac {\int \frac {\log \left (1+\frac {b x}{a}\right )}{x} \, dx}{b} \\ & = \frac {\log (x) \log \left (1+\frac {b x}{a}\right )}{b}+\frac {\operatorname {PolyLog}\left (2,-\frac {b x}{a}\right )}{b} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 30, normalized size of antiderivative = 1.03 \[ \int \frac {\log (x)}{a+b x} \, dx=\frac {\log (x) \log \left (\frac {a+b x}{a}\right )}{b}+\frac {\operatorname {PolyLog}\left (2,-\frac {b x}{a}\right )}{b} \]
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Time = 0.36 (sec) , antiderivative size = 32, normalized size of antiderivative = 1.10
method | result | size |
default | \(\frac {\operatorname {dilog}\left (\frac {b x +a}{a}\right )}{b}+\frac {\ln \left (x \right ) \ln \left (\frac {b x +a}{a}\right )}{b}\) | \(32\) |
risch | \(\frac {\operatorname {dilog}\left (\frac {b x +a}{a}\right )}{b}+\frac {\ln \left (x \right ) \ln \left (\frac {b x +a}{a}\right )}{b}\) | \(32\) |
parts | \(\frac {\ln \left (b x +a \right ) \ln \left (x \right )}{b}-\frac {\operatorname {dilog}\left (-\frac {b x}{a}\right )+\ln \left (b x +a \right ) \ln \left (-\frac {b x}{a}\right )}{b}\) | \(43\) |
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\[ \int \frac {\log (x)}{a+b x} \, dx=\int { \frac {\log \left (x\right )}{b x + a} \,d x } \]
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Result contains complex when optimal does not.
Time = 3.78 (sec) , antiderivative size = 177, normalized size of antiderivative = 6.10 \[ \int \frac {\log (x)}{a+b x} \, dx=\begin {cases} - \frac {\operatorname {Li}_{2}\left (\frac {b \left (\frac {a}{b} + x\right )}{a}\right )}{b} & \text {for}\: \frac {1}{\left |{\frac {a}{b} + x}\right |} < 1 \wedge \left |{\frac {a}{b} + x}\right | < 1 \\\frac {\log {\left (\frac {a}{b} \right )} \log {\left (\frac {a}{b} + x \right )}}{b} + \frac {i \pi \log {\left (\frac {a}{b} + x \right )}}{b} - \frac {\operatorname {Li}_{2}\left (\frac {b \left (\frac {a}{b} + x\right )}{a}\right )}{b} & \text {for}\: \left |{\frac {a}{b} + x}\right | < 1 \\- \frac {\log {\left (\frac {a}{b} \right )} \log {\left (\frac {1}{\frac {a}{b} + x} \right )}}{b} - \frac {i \pi \log {\left (\frac {1}{\frac {a}{b} + x} \right )}}{b} - \frac {\operatorname {Li}_{2}\left (\frac {b \left (\frac {a}{b} + x\right )}{a}\right )}{b} & \text {for}\: \frac {1}{\left |{\frac {a}{b} + x}\right |} < 1 \\- \frac {{G_{2, 2}^{2, 0}\left (\begin {matrix} & 1, 1 \\0, 0 & \end {matrix} \middle | {\frac {a}{b} + x} \right )} \log {\left (\frac {a}{b} \right )}}{b} - \frac {i \pi {G_{2, 2}^{2, 0}\left (\begin {matrix} & 1, 1 \\0, 0 & \end {matrix} \middle | {\frac {a}{b} + x} \right )}}{b} + \frac {{G_{2, 2}^{0, 2}\left (\begin {matrix} 1, 1 & \\ & 0, 0 \end {matrix} \middle | {\frac {a}{b} + x} \right )} \log {\left (\frac {a}{b} \right )}}{b} + \frac {i \pi {G_{2, 2}^{0, 2}\left (\begin {matrix} 1, 1 & \\ & 0, 0 \end {matrix} \middle | {\frac {a}{b} + x} \right )}}{b} - \frac {\operatorname {Li}_{2}\left (\frac {b \left (\frac {a}{b} + x\right )}{a}\right )}{b} & \text {otherwise} \end {cases} \]
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Time = 0.20 (sec) , antiderivative size = 25, normalized size of antiderivative = 0.86 \[ \int \frac {\log (x)}{a+b x} \, dx=\frac {\log \left (\frac {b x}{a} + 1\right ) \log \left (x\right ) + {\rm Li}_2\left (-\frac {b x}{a}\right )}{b} \]
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\[ \int \frac {\log (x)}{a+b x} \, dx=\int { \frac {\log \left (x\right )}{b x + a} \,d x } \]
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Timed out. \[ \int \frac {\log (x)}{a+b x} \, dx=\int \frac {\ln \left (x\right )}{a+b\,x} \,d x \]
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