Integrand size = 10, antiderivative size = 11 \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {\operatorname {ExpIntegralEi}(4 \log (c x))}{c^4} \]
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Time = 0.02 (sec) , antiderivative size = 11, 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 = {2346, 2209} \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {\operatorname {ExpIntegralEi}(4 \log (c x))}{c^4} \]
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Rule 2209
Rule 2346
Rubi steps \begin{align*} \text {integral}& = \frac {\text {Subst}\left (\int \frac {e^{4 x}}{x} \, dx,x,\log (c x)\right )}{c^4} \\ & = \frac {\text {Ei}(4 \log (c x))}{c^4} \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 11, normalized size of antiderivative = 1.00 \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {\operatorname {ExpIntegralEi}(4 \log (c x))}{c^4} \]
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Time = 0.03 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.27
method | result | size |
derivativedivides | \(-\frac {\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(14\) |
default | \(-\frac {\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(14\) |
risch | \(-\frac {\operatorname {Ei}_{1}\left (-4 \ln \left (x c \right )\right )}{c^{4}}\) | \(14\) |
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none
Time = 0.34 (sec) , antiderivative size = 12, normalized size of antiderivative = 1.09 \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {\operatorname {log\_integral}\left (c^{4} x^{4}\right )}{c^{4}} \]
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\[ \int \frac {x^3}{\log (c x)} \, dx=\int \frac {x^{3}}{\log {\left (c x \right )}}\, dx \]
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none
Time = 0.25 (sec) , antiderivative size = 11, normalized size of antiderivative = 1.00 \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {{\rm Ei}\left (4 \, \log \left (c x\right )\right )}{c^{4}} \]
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none
Time = 0.33 (sec) , antiderivative size = 11, normalized size of antiderivative = 1.00 \[ \int \frac {x^3}{\log (c x)} \, dx=\frac {{\rm Ei}\left (4 \, \log \left (c x\right )\right )}{c^{4}} \]
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Timed out. \[ \int \frac {x^3}{\log (c x)} \, dx=\int \frac {x^3}{\ln \left (c\,x\right )} \,d x \]
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