Optimal. Leaf size=38 \[ -\frac{\log \left (a x^3+b\right )}{3 b^2}+\frac{1}{3 b \left (a x^3+b\right )}+\frac{\log (x)}{b^2} \]
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Rubi [A] time = 0.0252161, antiderivative size = 38, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 3, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.231, Rules used = {263, 266, 44} \[ -\frac{\log \left (a x^3+b\right )}{3 b^2}+\frac{1}{3 b \left (a x^3+b\right )}+\frac{\log (x)}{b^2} \]
Antiderivative was successfully verified.
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Rule 263
Rule 266
Rule 44
Rubi steps
\begin{align*} \int \frac{1}{\left (a+\frac{b}{x^3}\right )^2 x^7} \, dx &=\int \frac{1}{x \left (b+a x^3\right )^2} \, dx\\ &=\frac{1}{3} \operatorname{Subst}\left (\int \frac{1}{x (b+a x)^2} \, dx,x,x^3\right )\\ &=\frac{1}{3} \operatorname{Subst}\left (\int \left (\frac{1}{b^2 x}-\frac{a}{b (b+a x)^2}-\frac{a}{b^2 (b+a x)}\right ) \, dx,x,x^3\right )\\ &=\frac{1}{3 b \left (b+a x^3\right )}+\frac{\log (x)}{b^2}-\frac{\log \left (b+a x^3\right )}{3 b^2}\\ \end{align*}
Mathematica [A] time = 0.0129779, size = 33, normalized size = 0.87 \[ \frac{\frac{b}{a x^3+b}-\log \left (a x^3+b\right )+3 \log (x)}{3 b^2} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.006, size = 35, normalized size = 0.9 \begin{align*}{\frac{1}{3\,b \left ( a{x}^{3}+b \right ) }}+{\frac{\ln \left ( x \right ) }{{b}^{2}}}-{\frac{\ln \left ( a{x}^{3}+b \right ) }{3\,{b}^{2}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 0.976622, size = 50, normalized size = 1.32 \begin{align*} \frac{1}{3 \,{\left (a b x^{3} + b^{2}\right )}} - \frac{\log \left (a x^{3} + b\right )}{3 \, b^{2}} + \frac{\log \left (x^{3}\right )}{3 \, b^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.45785, size = 108, normalized size = 2.84 \begin{align*} -\frac{{\left (a x^{3} + b\right )} \log \left (a x^{3} + b\right ) - 3 \,{\left (a x^{3} + b\right )} \log \left (x\right ) - b}{3 \,{\left (a b^{2} x^{3} + b^{3}\right )}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.729122, size = 34, normalized size = 0.89 \begin{align*} \frac{1}{3 a b x^{3} + 3 b^{2}} + \frac{\log{\left (x \right )}}{b^{2}} - \frac{\log{\left (x^{3} + \frac{b}{a} \right )}}{3 b^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.22704, size = 61, normalized size = 1.61 \begin{align*} -\frac{\log \left ({\left | a x^{3} + b \right |}\right )}{3 \, b^{2}} + \frac{\log \left ({\left | x \right |}\right )}{b^{2}} + \frac{a x^{3} + 2 \, b}{3 \,{\left (a x^{3} + b\right )} b^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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