Integrand size = 16, antiderivative size = 76 \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\frac {4 e^{-\frac {4 a}{b n}} x^4 \left (c x^n\right )^{-4/n} \operatorname {ExpIntegralEi}\left (\frac {4 \left (a+b \log \left (c x^n\right )\right )}{b n}\right )}{b^2 n^2}-\frac {x^4}{b n \left (a+b \log \left (c x^n\right )\right )} \]
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Time = 0.05 (sec) , antiderivative size = 76, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.188, Rules used = {2343, 2347, 2209} \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\frac {4 x^4 e^{-\frac {4 a}{b n}} \left (c x^n\right )^{-4/n} \operatorname {ExpIntegralEi}\left (\frac {4 \left (a+b \log \left (c x^n\right )\right )}{b n}\right )}{b^2 n^2}-\frac {x^4}{b n \left (a+b \log \left (c x^n\right )\right )} \]
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Rule 2209
Rule 2343
Rule 2347
Rubi steps \begin{align*} \text {integral}& = -\frac {x^4}{b n \left (a+b \log \left (c x^n\right )\right )}+\frac {4 \int \frac {x^3}{a+b \log \left (c x^n\right )} \, dx}{b n} \\ & = -\frac {x^4}{b n \left (a+b \log \left (c x^n\right )\right )}+\frac {\left (4 x^4 \left (c x^n\right )^{-4/n}\right ) \text {Subst}\left (\int \frac {e^{\frac {4 x}{n}}}{a+b x} \, dx,x,\log \left (c x^n\right )\right )}{b n^2} \\ & = \frac {4 e^{-\frac {4 a}{b n}} x^4 \left (c x^n\right )^{-4/n} \text {Ei}\left (\frac {4 \left (a+b \log \left (c x^n\right )\right )}{b n}\right )}{b^2 n^2}-\frac {x^4}{b n \left (a+b \log \left (c x^n\right )\right )} \\ \end{align*}
Time = 0.09 (sec) , antiderivative size = 70, normalized size of antiderivative = 0.92 \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\frac {x^4 \left (4 e^{-\frac {4 a}{b n}} \left (c x^n\right )^{-4/n} \operatorname {ExpIntegralEi}\left (\frac {4 \left (a+b \log \left (c x^n\right )\right )}{b n}\right )-\frac {b n}{a+b \log \left (c x^n\right )}\right )}{b^2 n^2} \]
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Result contains higher order function than in optimal. Order 9 vs. order 4.
Time = 0.35 (sec) , antiderivative size = 354, normalized size of antiderivative = 4.66
method | result | size |
risch | \(-\frac {2 x^{4}}{\left (-i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )+i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}+i b \pi \,\operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}-i b \pi \operatorname {csgn}\left (i c \,x^{n}\right )^{3}+2 b \ln \left (c \right )+2 \ln \left (x^{n}\right ) b +2 a \right ) b n}-\frac {4 x^{4} c^{-\frac {4}{n}} \left (x^{n}\right )^{-\frac {4}{n}} {\mathrm e}^{-\frac {2 \left (-i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )+i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}+i b \pi \,\operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}-i b \pi \operatorname {csgn}\left (i c \,x^{n}\right )^{3}+2 a \right )}{b n}} \operatorname {Ei}_{1}\left (-4 \ln \left (x \right )-\frac {2 \left (-i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )+i b \pi \,\operatorname {csgn}\left (i c \right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}+i b \pi \,\operatorname {csgn}\left (i x^{n}\right ) \operatorname {csgn}\left (i c \,x^{n}\right )^{2}-i b \pi \operatorname {csgn}\left (i c \,x^{n}\right )^{3}+2 b \ln \left (c \right )+2 b \left (\ln \left (x^{n}\right )-n \ln \left (x \right )\right )+2 a \right )}{b n}\right )}{b^{2} n^{2}}\) | \(354\) |
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Time = 0.30 (sec) , antiderivative size = 101, normalized size of antiderivative = 1.33 \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=-\frac {{\left (b n x^{4} e^{\left (\frac {4 \, {\left (b \log \left (c\right ) + a\right )}}{b n}\right )} - 4 \, {\left (b n \log \left (x\right ) + b \log \left (c\right ) + a\right )} \operatorname {log\_integral}\left (x^{4} e^{\left (\frac {4 \, {\left (b \log \left (c\right ) + a\right )}}{b n}\right )}\right )\right )} e^{\left (-\frac {4 \, {\left (b \log \left (c\right ) + a\right )}}{b n}\right )}}{b^{3} n^{3} \log \left (x\right ) + b^{3} n^{2} \log \left (c\right ) + a b^{2} n^{2}} \]
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\[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\int \frac {x^{3}}{\left (a + b \log {\left (c x^{n} \right )}\right )^{2}}\, dx \]
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\[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\int { \frac {x^{3}}{{\left (b \log \left (c x^{n}\right ) + a\right )}^{2}} \,d x } \]
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Leaf count of result is larger than twice the leaf count of optimal. 261 vs. \(2 (77) = 154\).
Time = 0.37 (sec) , antiderivative size = 261, normalized size of antiderivative = 3.43 \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=-\frac {b n x^{4}}{b^{3} n^{3} \log \left (x\right ) + b^{3} n^{2} \log \left (c\right ) + a b^{2} n^{2}} + \frac {4 \, b n {\rm Ei}\left (\frac {4 \, \log \left (c\right )}{n} + \frac {4 \, a}{b n} + 4 \, \log \left (x\right )\right ) e^{\left (-\frac {4 \, a}{b n}\right )} \log \left (x\right )}{{\left (b^{3} n^{3} \log \left (x\right ) + b^{3} n^{2} \log \left (c\right ) + a b^{2} n^{2}\right )} c^{\frac {4}{n}}} + \frac {4 \, b {\rm Ei}\left (\frac {4 \, \log \left (c\right )}{n} + \frac {4 \, a}{b n} + 4 \, \log \left (x\right )\right ) e^{\left (-\frac {4 \, a}{b n}\right )} \log \left (c\right )}{{\left (b^{3} n^{3} \log \left (x\right ) + b^{3} n^{2} \log \left (c\right ) + a b^{2} n^{2}\right )} c^{\frac {4}{n}}} + \frac {4 \, a {\rm Ei}\left (\frac {4 \, \log \left (c\right )}{n} + \frac {4 \, a}{b n} + 4 \, \log \left (x\right )\right ) e^{\left (-\frac {4 \, a}{b n}\right )}}{{\left (b^{3} n^{3} \log \left (x\right ) + b^{3} n^{2} \log \left (c\right ) + a b^{2} n^{2}\right )} c^{\frac {4}{n}}} \]
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Timed out. \[ \int \frac {x^3}{\left (a+b \log \left (c x^n\right )\right )^2} \, dx=\int \frac {x^3}{{\left (a+b\,\ln \left (c\,x^n\right )\right )}^2} \,d x \]
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