Integrand size = 17, antiderivative size = 98 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\frac {x}{4 a \left (a+b \left (c x^n\right )^{2/n}\right )^2}+\frac {3 x}{8 a^2 \left (a+b \left (c x^n\right )^{2/n}\right )}+\frac {3 x \left (c x^n\right )^{-1/n} \arctan \left (\frac {\sqrt {b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {a}}\right )}{8 a^{5/2} \sqrt {b}} \]
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Time = 0.02 (sec) , antiderivative size = 98, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.176, Rules used = {260, 205, 211} \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\frac {3 x \left (c x^n\right )^{-1/n} \arctan \left (\frac {\sqrt {b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {a}}\right )}{8 a^{5/2} \sqrt {b}}+\frac {3 x}{8 a^2 \left (a+b \left (c x^n\right )^{2/n}\right )}+\frac {x}{4 a \left (a+b \left (c x^n\right )^{2/n}\right )^2} \]
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Rule 205
Rule 211
Rule 260
Rubi steps \begin{align*} \text {integral}& = \left (x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{\left (a+b x^2\right )^3} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right ) \\ & = \frac {x}{4 a \left (a+b \left (c x^n\right )^{2/n}\right )^2}+\frac {\left (3 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{\left (a+b x^2\right )^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{4 a} \\ & = \frac {x}{4 a \left (a+b \left (c x^n\right )^{2/n}\right )^2}+\frac {3 x}{8 a^2 \left (a+b \left (c x^n\right )^{2/n}\right )}+\frac {\left (3 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{a+b x^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{8 a^2} \\ & = \frac {x}{4 a \left (a+b \left (c x^n\right )^{2/n}\right )^2}+\frac {3 x}{8 a^2 \left (a+b \left (c x^n\right )^{2/n}\right )}+\frac {3 x \left (c x^n\right )^{-1/n} \tan ^{-1}\left (\frac {\sqrt {b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {a}}\right )}{8 a^{5/2} \sqrt {b}} \\ \end{align*}
Time = 0.31 (sec) , antiderivative size = 91, normalized size of antiderivative = 0.93 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\frac {x \left (\frac {\sqrt {a} \left (5 a+3 b \left (c x^n\right )^{2/n}\right )}{\left (a+b \left (c x^n\right )^{2/n}\right )^2}+\frac {3 \left (c x^n\right )^{-1/n} \arctan \left (\frac {\sqrt {b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {a}}\right )}{\sqrt {b}}\right )}{8 a^{5/2}} \]
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Result contains higher order function than in optimal. Order 9 vs. order 3.
Time = 6.68 (sec) , antiderivative size = 378, normalized size of antiderivative = 3.86
method | result | size |
risch | \(\frac {x \left (3 b \,c^{\frac {2}{n}} \left (x^{n}\right )^{\frac {2}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}+5 a \right )}{8 a^{2} \left (a +b \,c^{\frac {2}{n}} \left (x^{n}\right )^{\frac {2}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}\right )^{2}}+\frac {3 \arctan \left (\frac {b \left (x^{n}\right )^{\frac {2}{n}} c^{\frac {2}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}}{x \sqrt {\frac {a b \left (x^{n}\right )^{\frac {2}{n}} c^{\frac {2}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}}{x^{2}}}}\right )}{8 a^{2} \sqrt {\frac {a b \left (x^{n}\right )^{\frac {2}{n}} c^{\frac {2}{n}} {\mathrm e}^{\frac {i \pi \,\operatorname {csgn}\left (i c \,x^{n}\right ) \left (-\operatorname {csgn}\left (i x^{n}\right )+\operatorname {csgn}\left (i c \,x^{n}\right )\right ) \left (\operatorname {csgn}\left (i c \right )-\operatorname {csgn}\left (i c \,x^{n}\right )\right )}{n}}}{x^{2}}}}\) | \(378\) |
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none
Time = 0.28 (sec) , antiderivative size = 328, normalized size of antiderivative = 3.35 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\left [\frac {6 \, a b^{2} c^{\frac {4}{n}} x^{3} + 10 \, a^{2} b c^{\frac {2}{n}} x - 3 \, {\left (b^{2} c^{\frac {4}{n}} x^{4} + 2 \, a b c^{\frac {2}{n}} x^{2} + a^{2}\right )} \sqrt {-a b c^{\frac {2}{n}}} \log \left (\frac {b c^{\frac {2}{n}} x^{2} - 2 \, \sqrt {-a b c^{\frac {2}{n}}} x - a}{b c^{\frac {2}{n}} x^{2} + a}\right )}{16 \, {\left (a^{3} b^{3} c^{\frac {6}{n}} x^{4} + 2 \, a^{4} b^{2} c^{\frac {4}{n}} x^{2} + a^{5} b c^{\frac {2}{n}}\right )}}, \frac {3 \, a b^{2} c^{\frac {4}{n}} x^{3} + 5 \, a^{2} b c^{\frac {2}{n}} x + 3 \, {\left (b^{2} c^{\frac {4}{n}} x^{4} + 2 \, a b c^{\frac {2}{n}} x^{2} + a^{2}\right )} \sqrt {a b c^{\frac {2}{n}}} \arctan \left (\frac {\sqrt {a b c^{\frac {2}{n}}} x}{a}\right )}{8 \, {\left (a^{3} b^{3} c^{\frac {6}{n}} x^{4} + 2 \, a^{4} b^{2} c^{\frac {4}{n}} x^{2} + a^{5} b c^{\frac {2}{n}}\right )}}\right ] \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\int \frac {1}{\left (a + b \left (c x^{n}\right )^{\frac {2}{n}}\right )^{3}}\, dx \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\int { \frac {1}{{\left (\left (c x^{n}\right )^{\frac {2}{n}} b + a\right )}^{3}} \,d x } \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\int { \frac {1}{{\left (\left (c x^{n}\right )^{\frac {2}{n}} b + a\right )}^{3}} \,d x } \]
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Timed out. \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{2/n}\right )^3} \, dx=\int \frac {1}{{\left (a+b\,{\left (c\,x^n\right )}^{2/n}\right )}^3} \,d x \]
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