Integrand size = 14, antiderivative size = 51 \[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\frac {\sqrt {\frac {\pi }{2}} \left (a x^n\right )^{2/n} \text {erf}\left (\frac {\sqrt {2} \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{\sqrt {n} x^2} \]
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Time = 0.02 (sec) , antiderivative size = 51, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.214, Rules used = {2347, 2211, 2236} \[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\frac {\sqrt {\frac {\pi }{2}} \left (a x^n\right )^{2/n} \text {erf}\left (\frac {\sqrt {2} \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{\sqrt {n} x^2} \]
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Rule 2211
Rule 2236
Rule 2347
Rubi steps \begin{align*} \text {integral}& = \frac {\left (a x^n\right )^{2/n} \text {Subst}\left (\int \frac {e^{-\frac {2 x}{n}}}{\sqrt {x}} \, dx,x,\log \left (a x^n\right )\right )}{n x^2} \\ & = \frac {\left (2 \left (a x^n\right )^{2/n}\right ) \text {Subst}\left (\int e^{-\frac {2 x^2}{n}} \, dx,x,\sqrt {\log \left (a x^n\right )}\right )}{n x^2} \\ & = \frac {\sqrt {\frac {\pi }{2}} \left (a x^n\right )^{2/n} \text {erf}\left (\frac {\sqrt {2} \sqrt {\log \left (a x^n\right )}}{\sqrt {n}}\right )}{\sqrt {n} x^2} \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 60, normalized size of antiderivative = 1.18 \[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=-\frac {\left (a x^n\right )^{2/n} \Gamma \left (\frac {1}{2},\frac {2 \log \left (a x^n\right )}{n}\right ) \sqrt {\frac {\log \left (a x^n\right )}{n}}}{\sqrt {2} x^2 \sqrt {\log \left (a x^n\right )}} \]
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\[\int \frac {1}{x^{3} \sqrt {\ln \left (a \,x^{n}\right )}}d x\]
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Exception generated. \[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\text {Exception raised: TypeError} \]
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\[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\int \frac {1}{x^{3} \sqrt {\log {\left (a x^{n} \right )}}}\, dx \]
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\[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\int { \frac {1}{x^{3} \sqrt {\log \left (a x^{n}\right )}} \,d x } \]
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\[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\int { \frac {1}{x^{3} \sqrt {\log \left (a x^{n}\right )}} \,d x } \]
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Timed out. \[ \int \frac {1}{x^3 \sqrt {\log \left (a x^n\right )}} \, dx=\int \frac {1}{x^3\,\sqrt {\ln \left (a\,x^n\right )}} \,d x \]
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