Optimal. Leaf size=89 \[ \frac{3 x \text{PolyLog}\left (2,-e^{2 (a+b x)}\right )}{b^3}-\frac{3 \text{PolyLog}\left (3,-e^{2 (a+b x)}\right )}{2 b^4}+\frac{3 x^2 \log \left (e^{2 (a+b x)}+1\right )}{b^2}-\frac{x^3 \tanh (a+b x)}{b}-\frac{x^3}{b}+\frac{x^4}{4} \]
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Rubi [A] time = 0.17831, antiderivative size = 89, normalized size of antiderivative = 1., number of steps used = 7, number of rules used = 7, integrand size = 12, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.583, Rules used = {3720, 3718, 2190, 2531, 2282, 6589, 30} \[ \frac{3 x \text{PolyLog}\left (2,-e^{2 (a+b x)}\right )}{b^3}-\frac{3 \text{PolyLog}\left (3,-e^{2 (a+b x)}\right )}{2 b^4}+\frac{3 x^2 \log \left (e^{2 (a+b x)}+1\right )}{b^2}-\frac{x^3 \tanh (a+b x)}{b}-\frac{x^3}{b}+\frac{x^4}{4} \]
Antiderivative was successfully verified.
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Rule 3720
Rule 3718
Rule 2190
Rule 2531
Rule 2282
Rule 6589
Rule 30
Rubi steps
\begin{align*} \int x^3 \tanh ^2(a+b x) \, dx &=-\frac{x^3 \tanh (a+b x)}{b}+\frac{3 \int x^2 \tanh (a+b x) \, dx}{b}+\int x^3 \, dx\\ &=-\frac{x^3}{b}+\frac{x^4}{4}-\frac{x^3 \tanh (a+b x)}{b}+\frac{6 \int \frac{e^{2 (a+b x)} x^2}{1+e^{2 (a+b x)}} \, dx}{b}\\ &=-\frac{x^3}{b}+\frac{x^4}{4}+\frac{3 x^2 \log \left (1+e^{2 (a+b x)}\right )}{b^2}-\frac{x^3 \tanh (a+b x)}{b}-\frac{6 \int x \log \left (1+e^{2 (a+b x)}\right ) \, dx}{b^2}\\ &=-\frac{x^3}{b}+\frac{x^4}{4}+\frac{3 x^2 \log \left (1+e^{2 (a+b x)}\right )}{b^2}+\frac{3 x \text{Li}_2\left (-e^{2 (a+b x)}\right )}{b^3}-\frac{x^3 \tanh (a+b x)}{b}-\frac{3 \int \text{Li}_2\left (-e^{2 (a+b x)}\right ) \, dx}{b^3}\\ &=-\frac{x^3}{b}+\frac{x^4}{4}+\frac{3 x^2 \log \left (1+e^{2 (a+b x)}\right )}{b^2}+\frac{3 x \text{Li}_2\left (-e^{2 (a+b x)}\right )}{b^3}-\frac{x^3 \tanh (a+b x)}{b}-\frac{3 \operatorname{Subst}\left (\int \frac{\text{Li}_2(-x)}{x} \, dx,x,e^{2 (a+b x)}\right )}{2 b^4}\\ &=-\frac{x^3}{b}+\frac{x^4}{4}+\frac{3 x^2 \log \left (1+e^{2 (a+b x)}\right )}{b^2}+\frac{3 x \text{Li}_2\left (-e^{2 (a+b x)}\right )}{b^3}-\frac{3 \text{Li}_3\left (-e^{2 (a+b x)}\right )}{2 b^4}-\frac{x^3 \tanh (a+b x)}{b}\\ \end{align*}
Mathematica [A] time = 4.53327, size = 104, normalized size = 1.17 \[ \frac{-6 b x \text{PolyLog}\left (2,-e^{-2 (a+b x)}\right )-3 \text{PolyLog}\left (3,-e^{-2 (a+b x)}\right )+2 b^2 x^2 \left (\frac{2 b x}{e^{2 a}+1}+3 \log \left (e^{-2 (a+b x)}+1\right )\right )}{2 b^4}-\frac{x^3 \text{sech}(a) \sinh (b x) \text{sech}(a+b x)}{b}+\frac{x^4}{4} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.056, size = 125, normalized size = 1.4 \begin{align*}{\frac{{x}^{4}}{4}}+2\,{\frac{{x}^{3}}{b \left ( 1+{{\rm e}^{2\,bx+2\,a}} \right ) }}-6\,{\frac{{a}^{2}\ln \left ({{\rm e}^{bx+a}} \right ) }{{b}^{4}}}-2\,{\frac{{x}^{3}}{b}}+6\,{\frac{{a}^{2}x}{{b}^{3}}}+4\,{\frac{{a}^{3}}{{b}^{4}}}+3\,{\frac{{x}^{2}\ln \left ( 1+{{\rm e}^{2\,bx+2\,a}} \right ) }{{b}^{2}}}+3\,{\frac{x{\it polylog} \left ( 2,-{{\rm e}^{2\,bx+2\,a}} \right ) }{{b}^{3}}}-{\frac{3\,{\it polylog} \left ( 3,-{{\rm e}^{2\,bx+2\,a}} \right ) }{2\,{b}^{4}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.34843, size = 146, normalized size = 1.64 \begin{align*} -\frac{2 \, x^{3}}{b} + \frac{b x^{4} e^{\left (2 \, b x + 2 \, a\right )} + b x^{4} + 8 \, x^{3}}{4 \,{\left (b e^{\left (2 \, b x + 2 \, a\right )} + b\right )}} + \frac{3 \,{\left (2 \, b^{2} x^{2} \log \left (e^{\left (2 \, b x + 2 \, a\right )} + 1\right ) + 2 \, b x{\rm Li}_2\left (-e^{\left (2 \, b x + 2 \, a\right )}\right ) -{\rm Li}_{3}(-e^{\left (2 \, b x + 2 \, a\right )})\right )}}{2 \, b^{4}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [C] time = 2.31947, size = 1890, normalized size = 21.24 \begin{align*} \text{result too large to display} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F(-1)] time = 0., size = 0, normalized size = 0. \begin{align*} \text{Timed out} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int x^{3} \operatorname{sech}\left (b x + a\right )^{2} \sinh \left (b x + a\right )^{2}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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