Integrand size = 10, antiderivative size = 37 \[ \int \frac {x^3}{\log ^3(c x)} \, dx=\frac {8 \operatorname {ExpIntegralEi}(4 \log (c x))}{c^4}-\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)} \]
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Time = 0.03 (sec) , antiderivative size = 37, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.300, Rules used = {2343, 2346, 2209} \[ \int \frac {x^3}{\log ^3(c x)} \, dx=\frac {8 \operatorname {ExpIntegralEi}(4 \log (c x))}{c^4}-\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)} \]
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Rule 2209
Rule 2343
Rule 2346
Rubi steps \begin{align*} \text {integral}& = -\frac {x^4}{2 \log ^2(c x)}+2 \int \frac {x^3}{\log ^2(c x)} \, dx \\ & = -\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)}+8 \int \frac {x^3}{\log (c x)} \, dx \\ & = -\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)}+\frac {8 \text {Subst}\left (\int \frac {e^{4 x}}{x} \, dx,x,\log (c x)\right )}{c^4} \\ & = \frac {8 \text {Ei}(4 \log (c x))}{c^4}-\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)} \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 37, normalized size of antiderivative = 1.00 \[ \int \frac {x^3}{\log ^3(c x)} \, dx=\frac {8 \operatorname {ExpIntegralEi}(4 \log (c x))}{c^4}-\frac {x^4}{2 \log ^2(c x)}-\frac {2 x^4}{\log (c x)} \]
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Time = 0.03 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.92
method | result | size |
risch | \(-\frac {x^{4} \left (1+4 \ln \left (x c \right )\right )}{2 \ln \left (x c \right )^{2}}-\frac {8 \,\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(34\) |
derivativedivides | \(\frac {-\frac {x^{4} c^{4}}{2 \ln \left (x c \right )^{2}}-\frac {2 x^{4} c^{4}}{\ln \left (x c \right )}-8 \,\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(44\) |
default | \(\frac {-\frac {x^{4} c^{4}}{2 \ln \left (x c \right )^{2}}-\frac {2 x^{4} c^{4}}{\ln \left (x c \right )}-8 \,\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(44\) |
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Time = 0.30 (sec) , antiderivative size = 47, normalized size of antiderivative = 1.27 \[ \int \frac {x^3}{\log ^3(c x)} \, dx=-\frac {4 \, c^{4} x^{4} \log \left (c x\right ) + c^{4} x^{4} - 16 \, \log \left (c x\right )^{2} \operatorname {log\_integral}\left (c^{4} x^{4}\right )}{2 \, c^{4} \log \left (c x\right )^{2}} \]
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\[ \int \frac {x^3}{\log ^3(c x)} \, dx=\frac {- 4 x^{4} \log {\left (c x \right )} - x^{4}}{2 \log {\left (c x \right )}^{2}} + 8 \int \frac {x^{3}}{\log {\left (c x \right )}}\, dx \]
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Time = 0.24 (sec) , antiderivative size = 13, normalized size of antiderivative = 0.35 \[ \int \frac {x^3}{\log ^3(c x)} \, dx=-\frac {16 \, \Gamma \left (-2, -4 \, \log \left (c x\right )\right )}{c^{4}} \]
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Time = 0.29 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.95 \[ \int \frac {x^3}{\log ^3(c x)} \, dx=-\frac {2 \, x^{4}}{\log \left (c x\right )} - \frac {x^{4}}{2 \, \log \left (c x\right )^{2}} + \frac {8 \, {\rm Ei}\left (4 \, \log \left (c x\right )\right )}{c^{4}} \]
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Timed out. \[ \int \frac {x^3}{\log ^3(c x)} \, dx=\int \frac {x^3}{{\ln \left (c\,x\right )}^3} \,d x \]
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