Optimal. Leaf size=115 \[ \frac{\log \left (a^{2/3} x^2-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3}\right )}{6 a^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{a} x+\sqrt [3]{b}\right )}{3 a^{2/3} \sqrt [3]{b}}-\frac{\tan ^{-1}\left (\frac{\sqrt [3]{b}-2 \sqrt [3]{a} x}{\sqrt{3} \sqrt [3]{b}}\right )}{\sqrt{3} a^{2/3} \sqrt [3]{b}} \]
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Rubi [A] time = 0.0512239, antiderivative size = 115, normalized size of antiderivative = 1., number of steps used = 7, number of rules used = 7, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.538, Rules used = {263, 292, 31, 634, 617, 204, 628} \[ \frac{\log \left (a^{2/3} x^2-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3}\right )}{6 a^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{a} x+\sqrt [3]{b}\right )}{3 a^{2/3} \sqrt [3]{b}}-\frac{\tan ^{-1}\left (\frac{\sqrt [3]{b}-2 \sqrt [3]{a} x}{\sqrt{3} \sqrt [3]{b}}\right )}{\sqrt{3} a^{2/3} \sqrt [3]{b}} \]
Antiderivative was successfully verified.
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Rule 263
Rule 292
Rule 31
Rule 634
Rule 617
Rule 204
Rule 628
Rubi steps
\begin{align*} \int \frac{1}{\left (a+\frac{b}{x^3}\right ) x^2} \, dx &=\int \frac{x}{b+a x^3} \, dx\\ &=-\frac{\int \frac{1}{\sqrt [3]{b}+\sqrt [3]{a} x} \, dx}{3 \sqrt [3]{a} \sqrt [3]{b}}+\frac{\int \frac{\sqrt [3]{b}+\sqrt [3]{a} x}{b^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+a^{2/3} x^2} \, dx}{3 \sqrt [3]{a} \sqrt [3]{b}}\\ &=-\frac{\log \left (\sqrt [3]{b}+\sqrt [3]{a} x\right )}{3 a^{2/3} \sqrt [3]{b}}+\frac{\int \frac{1}{b^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+a^{2/3} x^2} \, dx}{2 \sqrt [3]{a}}+\frac{\int \frac{-\sqrt [3]{a} \sqrt [3]{b}+2 a^{2/3} x}{b^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+a^{2/3} x^2} \, dx}{6 a^{2/3} \sqrt [3]{b}}\\ &=-\frac{\log \left (\sqrt [3]{b}+\sqrt [3]{a} x\right )}{3 a^{2/3} \sqrt [3]{b}}+\frac{\log \left (b^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+a^{2/3} x^2\right )}{6 a^{2/3} \sqrt [3]{b}}+\frac{\operatorname{Subst}\left (\int \frac{1}{-3-x^2} \, dx,x,1-\frac{2 \sqrt [3]{a} x}{\sqrt [3]{b}}\right )}{a^{2/3} \sqrt [3]{b}}\\ &=-\frac{\tan ^{-1}\left (\frac{\sqrt [3]{b}-2 \sqrt [3]{a} x}{\sqrt{3} \sqrt [3]{b}}\right )}{\sqrt{3} a^{2/3} \sqrt [3]{b}}-\frac{\log \left (\sqrt [3]{b}+\sqrt [3]{a} x\right )}{3 a^{2/3} \sqrt [3]{b}}+\frac{\log \left (b^{2/3}-\sqrt [3]{a} \sqrt [3]{b} x+a^{2/3} x^2\right )}{6 a^{2/3} \sqrt [3]{b}}\\ \end{align*}
Mathematica [A] time = 0.0103804, size = 89, normalized size = 0.77 \[ \frac{\log \left (a^{2/3} x^2-\sqrt [3]{a} \sqrt [3]{b} x+b^{2/3}\right )-2 \log \left (\sqrt [3]{a} x+\sqrt [3]{b}\right )-2 \sqrt{3} \tan ^{-1}\left (\frac{1-\frac{2 \sqrt [3]{a} x}{\sqrt [3]{b}}}{\sqrt{3}}\right )}{6 a^{2/3} \sqrt [3]{b}} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.001, size = 91, normalized size = 0.8 \begin{align*} -{\frac{1}{3\,a}\ln \left ( x+\sqrt [3]{{\frac{b}{a}}} \right ){\frac{1}{\sqrt [3]{{\frac{b}{a}}}}}}+{\frac{1}{6\,a}\ln \left ({x}^{2}-\sqrt [3]{{\frac{b}{a}}}x+ \left ({\frac{b}{a}} \right ) ^{{\frac{2}{3}}} \right ){\frac{1}{\sqrt [3]{{\frac{b}{a}}}}}}+{\frac{\sqrt{3}}{3\,a}\arctan \left ({\frac{\sqrt{3}}{3} \left ( 2\,{x{\frac{1}{\sqrt [3]{{\frac{b}{a}}}}}}-1 \right ) } \right ){\frac{1}{\sqrt [3]{{\frac{b}{a}}}}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F(-2)] time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.52707, size = 744, normalized size = 6.47 \begin{align*} \left [\frac{3 \, \sqrt{\frac{1}{3}} a b \sqrt{\frac{\left (-a^{2} b\right )^{\frac{1}{3}}}{b}} \log \left (\frac{2 \, a^{2} x^{3} - a b + 3 \, \sqrt{\frac{1}{3}}{\left (a b x + 2 \, \left (-a^{2} b\right )^{\frac{2}{3}} x^{2} + \left (-a^{2} b\right )^{\frac{1}{3}} b\right )} \sqrt{\frac{\left (-a^{2} b\right )^{\frac{1}{3}}}{b}} - 3 \, \left (-a^{2} b\right )^{\frac{2}{3}} x}{a x^{3} + b}\right ) + \left (-a^{2} b\right )^{\frac{2}{3}} \log \left (a^{2} x^{2} + \left (-a^{2} b\right )^{\frac{1}{3}} a x + \left (-a^{2} b\right )^{\frac{2}{3}}\right ) - 2 \, \left (-a^{2} b\right )^{\frac{2}{3}} \log \left (a x - \left (-a^{2} b\right )^{\frac{1}{3}}\right )}{6 \, a^{2} b}, \frac{6 \, \sqrt{\frac{1}{3}} a b \sqrt{-\frac{\left (-a^{2} b\right )^{\frac{1}{3}}}{b}} \arctan \left (\frac{\sqrt{\frac{1}{3}}{\left (2 \, a x + \left (-a^{2} b\right )^{\frac{1}{3}}\right )} \sqrt{-\frac{\left (-a^{2} b\right )^{\frac{1}{3}}}{b}}}{a}\right ) + \left (-a^{2} b\right )^{\frac{2}{3}} \log \left (a^{2} x^{2} + \left (-a^{2} b\right )^{\frac{1}{3}} a x + \left (-a^{2} b\right )^{\frac{2}{3}}\right ) - 2 \, \left (-a^{2} b\right )^{\frac{2}{3}} \log \left (a x - \left (-a^{2} b\right )^{\frac{1}{3}}\right )}{6 \, a^{2} b}\right ] \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.168154, size = 24, normalized size = 0.21 \begin{align*} \operatorname{RootSum}{\left (27 t^{3} a^{2} b + 1, \left ( t \mapsto t \log{\left (9 t^{2} a b + x \right )} \right )\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.15329, size = 151, normalized size = 1.31 \begin{align*} -\frac{\left (-\frac{b}{a}\right )^{\frac{2}{3}} \log \left ({\left | x - \left (-\frac{b}{a}\right )^{\frac{1}{3}} \right |}\right )}{3 \, b} - \frac{\sqrt{3} \left (-a^{2} b\right )^{\frac{2}{3}} \arctan \left (\frac{\sqrt{3}{\left (2 \, x + \left (-\frac{b}{a}\right )^{\frac{1}{3}}\right )}}{3 \, \left (-\frac{b}{a}\right )^{\frac{1}{3}}}\right )}{3 \, a^{2} b} + \frac{\left (-a^{2} b\right )^{\frac{2}{3}} \log \left (x^{2} + x \left (-\frac{b}{a}\right )^{\frac{1}{3}} + \left (-\frac{b}{a}\right )^{\frac{2}{3}}\right )}{6 \, a^{2} b} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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