Integrand size = 19, antiderivative size = 90 \[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\frac {x^3 \left (c x^n\right )^{-2/n}}{b^2}-\frac {a^2 x^3 \left (c x^n\right )^{-3/n}}{b^3 \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}-\frac {2 a x^3 \left (c x^n\right )^{-3/n} \log \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}{b^3} \]
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Time = 0.02 (sec) , antiderivative size = 90, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.105, Rules used = {375, 45} \[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=-\frac {a^2 x^3 \left (c x^n\right )^{-3/n}}{b^3 \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}-\frac {2 a x^3 \left (c x^n\right )^{-3/n} \log \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}{b^3}+\frac {x^3 \left (c x^n\right )^{-2/n}}{b^2} \]
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Rule 45
Rule 375
Rubi steps \begin{align*} \text {integral}& = \left (x^3 \left (c x^n\right )^{-3/n}\right ) \text {Subst}\left (\int \frac {x^2}{(a+b x)^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right ) \\ & = \left (x^3 \left (c x^n\right )^{-3/n}\right ) \text {Subst}\left (\int \left (\frac {1}{b^2}+\frac {a^2}{b^2 (a+b x)^2}-\frac {2 a}{b^2 (a+b x)}\right ) \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right ) \\ & = \frac {x^3 \left (c x^n\right )^{-2/n}}{b^2}-\frac {a^2 x^3 \left (c x^n\right )^{-3/n}}{b^3 \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}-\frac {2 a x^3 \left (c x^n\right )^{-3/n} \log \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )}{b^3} \\ \end{align*}
Time = 0.22 (sec) , antiderivative size = 67, normalized size of antiderivative = 0.74 \[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\frac {x^3 \left (c x^n\right )^{-3/n} \left (b \left (c x^n\right )^{\frac {1}{n}}-\frac {a^2}{a+b \left (c x^n\right )^{\frac {1}{n}}}-2 a \log \left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )\right )}{b^3} \]
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Result contains higher order function than in optimal. Order 9 vs. order 3.
Time = 4.13 (sec) , antiderivative size = 386, normalized size of antiderivative = 4.29
method | result | size |
risch | \(\frac {x^{3}}{a \left (b \left (x^{n}\right )^{\frac {1}{n}} c^{\frac {1}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{2 n}}+a \right )}-\frac {\left (x^{n}\right )^{-\frac {1}{n}} c^{-\frac {1}{n}} x^{3} {\mathrm e}^{-\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{2 n}}}{a b}+\frac {2 \left (x^{n}\right )^{-\frac {2}{n}} c^{-\frac {2}{n}} x^{3} {\mathrm e}^{-\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}}{b^{2}}-\frac {2 a \ln \left (b \left (x^{n}\right )^{\frac {1}{n}} c^{\frac {1}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{2 n}}+a \right ) \left (x^{n}\right )^{-\frac {1}{n}} c^{-\frac {1}{n}} c^{-\frac {2}{n}} \left (x^{n}\right )^{-\frac {2}{n}} x^{3} {\mathrm e}^{-\frac {3 i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{2 n}}}{b^{3}}\) | \(386\) |
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Time = 0.30 (sec) , antiderivative size = 83, normalized size of antiderivative = 0.92 \[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\frac {b^{2} c^{\frac {2}{n}} x^{2} + a b c^{\left (\frac {1}{n}\right )} x - a^{2} - 2 \, {\left (a b c^{\left (\frac {1}{n}\right )} x + a^{2}\right )} \log \left (b c^{\left (\frac {1}{n}\right )} x + a\right )}{b^{4} c^{\frac {4}{n}} x + a b^{3} c^{\frac {3}{n}}} \]
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\[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\int \frac {x^{2}}{\left (a + b \left (c x^{n}\right )^{\frac {1}{n}}\right )^{2}}\, dx \]
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\[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\int { \frac {x^{2}}{{\left (\left (c x^{n}\right )^{\left (\frac {1}{n}\right )} b + a\right )}^{2}} \,d x } \]
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\[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\int { \frac {x^{2}}{{\left (\left (c x^{n}\right )^{\left (\frac {1}{n}\right )} b + a\right )}^{2}} \,d x } \]
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Timed out. \[ \int \frac {x^2}{\left (a+b \left (c x^n\right )^{\frac {1}{n}}\right )^2} \, dx=\int \frac {x^2}{{\left (a+b\,{\left (c\,x^n\right )}^{1/n}\right )}^2} \,d x \]
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