Integrand size = 14, antiderivative size = 63 \[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\frac {4 \sqrt {\pi } x^4 \left (a x^n\right )^{-4/n} \text {erfi}\left (\frac {2 \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{n^{3/2}}-\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}} \]
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Time = 0.03 (sec) , antiderivative size = 63, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.286, Rules used = {2343, 2347, 2211, 2235} \[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\frac {4 \sqrt {\pi } x^4 \left (a x^n\right )^{-4/n} \text {erfi}\left (\frac {2 \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{n^{3/2}}-\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}} \]
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Rule 2211
Rule 2235
Rule 2343
Rule 2347
Rubi steps \begin{align*} \text {integral}& = -\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}}+\frac {8 \int \frac {x^3}{\sqrt {\log \left (a x^n\right )}} \, dx}{n} \\ & = -\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}}+\frac {\left (8 x^4 \left (a x^n\right )^{-4/n}\right ) \text {Subst}\left (\int \frac {e^{\frac {4 x}{n}}}{\sqrt {x}} \, dx,x,\log \left (a x^n\right )\right )}{n^2} \\ & = -\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}}+\frac {\left (16 x^4 \left (a x^n\right )^{-4/n}\right ) \text {Subst}\left (\int e^{\frac {4 x^2}{n}} \, dx,x,\sqrt {\log \left (a x^n\right )}\right )}{n^2} \\ & = \frac {4 \sqrt {\pi } x^4 \left (a x^n\right )^{-4/n} \text {erfi}\left (\frac {2 \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{n^{3/2}}-\frac {2 x^4}{n \sqrt {\log \left (a x^n\right )}} \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 73, normalized size of antiderivative = 1.16 \[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=-\frac {2 x^4 \left (a x^n\right )^{-4/n} \left (\left (a x^n\right )^{4/n}-2 \Gamma \left (\frac {1}{2},-\frac {4 \log \left (a x^n\right )}{n}\right ) \sqrt {-\frac {\log \left (a x^n\right )}{n}}\right )}{n \sqrt {\log \left (a x^n\right )}} \]
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\[\int \frac {x^{3}}{\ln \left (a \,x^{n}\right )^{\frac {3}{2}}}d x\]
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Exception generated. \[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\text {Exception raised: TypeError} \]
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\[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\int \frac {x^{3}}{\log {\left (a x^{n} \right )}^{\frac {3}{2}}}\, dx \]
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\[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\int { \frac {x^{3}}{\log \left (a x^{n}\right )^{\frac {3}{2}}} \,d x } \]
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\[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\int { \frac {x^{3}}{\log \left (a x^{n}\right )^{\frac {3}{2}}} \,d x } \]
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Timed out. \[ \int \frac {x^3}{\log ^{\frac {3}{2}}\left (a x^n\right )} \, dx=\int \frac {x^3}{{\ln \left (a\,x^n\right )}^{3/2}} \,d x \]
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