Integrand size = 8, antiderivative size = 37 \[ \int \log ^2(a+b x) \, dx=2 x-\frac {2 (a+b x) \log (a+b x)}{b}+\frac {(a+b x) \log ^2(a+b x)}{b} \]
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Time = 0.01 (sec) , antiderivative size = 37, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {2436, 2333, 2332} \[ \int \log ^2(a+b x) \, dx=\frac {(a+b x) \log ^2(a+b x)}{b}-\frac {2 (a+b x) \log (a+b x)}{b}+2 x \]
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Rule 2332
Rule 2333
Rule 2436
Rubi steps \begin{align*} \text {integral}& = \frac {\text {Subst}\left (\int \log ^2(x) \, dx,x,a+b x\right )}{b} \\ & = \frac {(a+b x) \log ^2(a+b x)}{b}-\frac {2 \text {Subst}(\int \log (x) \, dx,x,a+b x)}{b} \\ & = 2 x-\frac {2 (a+b x) \log (a+b x)}{b}+\frac {(a+b x) \log ^2(a+b x)}{b} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.97 \[ \int \log ^2(a+b x) \, dx=\frac {2 b x-2 (a+b x) \log (a+b x)+(a+b x) \log ^2(a+b x)}{b} \]
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Time = 0.12 (sec) , antiderivative size = 40, normalized size of antiderivative = 1.08
method | result | size |
derivativedivides | \(\frac {\ln \left (b x +a \right )^{2} \left (b x +a \right )-2 \left (b x +a \right ) \ln \left (b x +a \right )+2 b x +2 a}{b}\) | \(40\) |
default | \(\frac {\ln \left (b x +a \right )^{2} \left (b x +a \right )-2 \left (b x +a \right ) \ln \left (b x +a \right )+2 b x +2 a}{b}\) | \(40\) |
risch | \(\frac {\left (b x +a \right ) \ln \left (b x +a \right )^{2}}{b}-2 x \ln \left (b x +a \right )+2 x -\frac {2 a \ln \left (b x +a \right )}{b}\) | \(43\) |
norman | \(x \ln \left (b x +a \right )^{2}+\frac {a \ln \left (b x +a \right )^{2}}{b}+2 x -2 x \ln \left (b x +a \right )-\frac {2 a \ln \left (b x +a \right )}{b}\) | \(49\) |
parallelrisch | \(\frac {x \ln \left (b x +a \right )^{2} b -2 \ln \left (b x +a \right ) x b +\ln \left (b x +a \right )^{2} a +2 b x -2 a \ln \left (b x +a \right )-2 a}{b}\) | \(53\) |
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none
Time = 0.26 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.97 \[ \int \log ^2(a+b x) \, dx=\frac {{\left (b x + a\right )} \log \left (b x + a\right )^{2} + 2 \, b x - 2 \, {\left (b x + a\right )} \log \left (b x + a\right )}{b} \]
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Time = 0.09 (sec) , antiderivative size = 42, normalized size of antiderivative = 1.14 \[ \int \log ^2(a+b x) \, dx=2 b \left (- \frac {a \log {\left (a + b x \right )}}{b^{2}} + \frac {x}{b}\right ) - 2 x \log {\left (a + b x \right )} + \frac {\left (a + b x\right ) \log {\left (a + b x \right )}^{2}}{b} \]
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none
Time = 0.20 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.73 \[ \int \log ^2(a+b x) \, dx=\frac {{\left (b x + a\right )} {\left (\log \left (b x + a\right )^{2} - 2 \, \log \left (b x + a\right ) + 2\right )}}{b} \]
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Time = 0.31 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.19 \[ \int \log ^2(a+b x) \, dx=\frac {{\left (b x + a\right )} \log \left (b x + a\right )^{2}}{b} - \frac {2 \, {\left (b x + a\right )} \log \left (b x + a\right )}{b} + \frac {2 \, {\left (b x + a\right )}}{b} \]
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Time = 1.43 (sec) , antiderivative size = 48, normalized size of antiderivative = 1.30 \[ \int \log ^2(a+b x) \, dx=2\,x-2\,x\,\ln \left (a+b\,x\right )+x\,{\ln \left (a+b\,x\right )}^2+\frac {a\,{\ln \left (a+b\,x\right )}^2}{b}-\frac {2\,a\,\ln \left (a+b\,x\right )}{b} \]
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