Integrand size = 17, antiderivative size = 210 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}-\frac {2 x \left (c x^n\right )^{-1/n} \arctan \left (\frac {\sqrt [3]{a}-2 \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {3} \sqrt [3]{a}}\right )}{3 \sqrt {3} a^{5/3} \sqrt [3]{b}}+\frac {2 x \left (c x^n\right )^{-1/n} \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}}-\frac {x \left (c x^n\right )^{-1/n} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}+b^{2/3} \left (c x^n\right )^{2/n}\right )}{9 a^{5/3} \sqrt [3]{b}} \]
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Time = 0.08 (sec) , antiderivative size = 210, normalized size of antiderivative = 1.00, number of steps used = 8, number of rules used = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.471, Rules used = {260, 205, 206, 31, 648, 631, 210, 642} \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=-\frac {2 x \left (c x^n\right )^{-1/n} \arctan \left (\frac {\sqrt [3]{a}-2 \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt {3} \sqrt [3]{a}}\right )}{3 \sqrt {3} a^{5/3} \sqrt [3]{b}}-\frac {x \left (c x^n\right )^{-1/n} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}+b^{2/3} \left (c x^n\right )^{2/n}\right )}{9 a^{5/3} \sqrt [3]{b}}+\frac {2 x \left (c x^n\right )^{-1/n} \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}}+\frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )} \]
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Rule 31
Rule 205
Rule 206
Rule 210
Rule 260
Rule 631
Rule 642
Rule 648
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^3\right )^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right ) \\ & = \frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}+\frac {\left (2 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{a+b x^3} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{3 a} \\ & = \frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}+\frac {\left (2 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{\sqrt [3]{a}+\sqrt [3]{b} x} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3}}+\frac {\left (2 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {2 \sqrt [3]{a}-\sqrt [3]{b} x}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3}} \\ & = \frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}+\frac {2 x \left (c x^n\right )^{-1/n} \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}}+\frac {\left (x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{3 a^{4/3}}-\frac {\left (x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {-\sqrt [3]{a} \sqrt [3]{b}+2 b^{2/3} x}{a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3} x^2} \, dx,x,\left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}} \\ & = \frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}+\frac {2 x \left (c x^n\right )^{-1/n} \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}}-\frac {x \left (c x^n\right )^{-1/n} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}+b^{2/3} \left (c x^n\right )^{2/n}\right )}{9 a^{5/3} \sqrt [3]{b}}+\frac {\left (2 x \left (c x^n\right )^{-1/n}\right ) \text {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,1-\frac {2 \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt [3]{a}}\right )}{3 a^{5/3} \sqrt [3]{b}} \\ & = \frac {x}{3 a \left (a+b \left (c x^n\right )^{3/n}\right )}-\frac {2 x \left (c x^n\right )^{-1/n} \tan ^{-1}\left (\frac {1-\frac {2 \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt [3]{a}}}{\sqrt {3}}\right )}{3 \sqrt {3} a^{5/3} \sqrt [3]{b}}+\frac {2 x \left (c x^n\right )^{-1/n} \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{9 a^{5/3} \sqrt [3]{b}}-\frac {x \left (c x^n\right )^{-1/n} \log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}+b^{2/3} \left (c x^n\right )^{2/n}\right )}{9 a^{5/3} \sqrt [3]{b}} \\ \end{align*}
Time = 0.56 (sec) , antiderivative size = 178, normalized size of antiderivative = 0.85 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\frac {x \left (c x^n\right )^{-1/n} \left (\frac {3 a^{2/3} \left (c x^n\right )^{\frac {1}{n}}}{a+b \left (c x^n\right )^{3/n}}-\frac {2 \sqrt {3} \arctan \left (\frac {1-\frac {2 \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}}{\sqrt [3]{a}}}{\sqrt {3}}\right )}{\sqrt [3]{b}}+\frac {2 \log \left (\sqrt [3]{a}+\sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}\right )}{\sqrt [3]{b}}-\frac {\log \left (a^{2/3}-\sqrt [3]{a} \sqrt [3]{b} \left (c x^n\right )^{\frac {1}{n}}+b^{2/3} \left (c x^n\right )^{2/n}\right )}{\sqrt [3]{b}}\right )}{9 a^{5/3}} \]
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Result contains higher order function than in optimal. Order 9 vs. order 3.
Time = 6.37 (sec) , antiderivative size = 908, normalized size of antiderivative = 4.32
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none
Time = 0.39 (sec) , antiderivative size = 705, normalized size of antiderivative = 3.36 \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\left [\frac {3 \, a^{2} b c^{\frac {3}{n}} x + 3 \, \sqrt {\frac {1}{3}} {\left (a b^{2} c^{\frac {6}{n}} x^{3} + a^{2} b c^{\frac {3}{n}}\right )} \sqrt {-\frac {\left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}}}{b c^{\frac {3}{n}}}} \log \left (\frac {2 \, a b c^{\frac {3}{n}} x^{3} - 3 \, \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}} a x - a^{2} + 3 \, \sqrt {\frac {1}{3}} {\left (2 \, a b c^{\frac {3}{n}} x^{2} + \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} x - \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}} a\right )} \sqrt {-\frac {\left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}}}{b c^{\frac {3}{n}}}}}{b c^{\frac {3}{n}} x^{3} + a}\right ) - {\left (b c^{\frac {3}{n}} x^{3} + a\right )} \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} \log \left (a b c^{\frac {3}{n}} x^{2} - \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} x + \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}} a\right ) + 2 \, {\left (b c^{\frac {3}{n}} x^{3} + a\right )} \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} \log \left (a b c^{\frac {3}{n}} x + \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}}\right )}{9 \, {\left (a^{3} b^{2} c^{\frac {6}{n}} x^{3} + a^{4} b c^{\frac {3}{n}}\right )}}, \frac {3 \, a^{2} b c^{\frac {3}{n}} x + 6 \, \sqrt {\frac {1}{3}} {\left (a b^{2} c^{\frac {6}{n}} x^{3} + a^{2} b c^{\frac {3}{n}}\right )} \sqrt {\frac {\left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}}}{b c^{\frac {3}{n}}}} \arctan \left (\frac {\sqrt {\frac {1}{3}} {\left (2 \, \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} x - \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}} a\right )} \sqrt {\frac {\left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}}}{b c^{\frac {3}{n}}}}}{a^{2}}\right ) - {\left (b c^{\frac {3}{n}} x^{3} + a\right )} \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} \log \left (a b c^{\frac {3}{n}} x^{2} - \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} x + \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {1}{3}} a\right ) + 2 \, {\left (b c^{\frac {3}{n}} x^{3} + a\right )} \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}} \log \left (a b c^{\frac {3}{n}} x + \left (a^{2} b c^{\frac {3}{n}}\right )^{\frac {2}{3}}\right )}{9 \, {\left (a^{3} b^{2} c^{\frac {6}{n}} x^{3} + a^{4} b c^{\frac {3}{n}}\right )}}\right ] \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\int \frac {1}{\left (a + b \left (c x^{n}\right )^{\frac {3}{n}}\right )^{2}}\, dx \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\int { \frac {1}{{\left (\left (c x^{n}\right )^{\frac {3}{n}} b + a\right )}^{2}} \,d x } \]
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\[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\int { \frac {1}{{\left (\left (c x^{n}\right )^{\frac {3}{n}} b + a\right )}^{2}} \,d x } \]
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Timed out. \[ \int \frac {1}{\left (a+b \left (c x^n\right )^{3/n}\right )^2} \, dx=\int \frac {1}{{\left (a+b\,{\left (c\,x^n\right )}^{3/n}\right )}^2} \,d x \]
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