Optimal. Leaf size=16 \[ \frac{\tanh ^{-1}(\tanh (a+b x))^3}{3 b} \]
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Rubi [A] time = 0.0043591, antiderivative size = 16, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 9, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.222, Rules used = {2157, 30} \[ \frac{\tanh ^{-1}(\tanh (a+b x))^3}{3 b} \]
Antiderivative was successfully verified.
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Rule 2157
Rule 30
Rubi steps
\begin{align*} \int \tanh ^{-1}(\tanh (a+b x))^2 \, dx &=\frac{\operatorname{Subst}\left (\int x^2 \, dx,x,\tanh ^{-1}(\tanh (a+b x))\right )}{b}\\ &=\frac{\tanh ^{-1}(\tanh (a+b x))^3}{3 b}\\ \end{align*}
Mathematica [A] time = 0.0057246, size = 16, normalized size = 1. \[ \frac{\tanh ^{-1}(\tanh (a+b x))^3}{3 b} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.027, size = 15, normalized size = 0.9 \begin{align*}{\frac{ \left ({\it Artanh} \left ( \tanh \left ( bx+a \right ) \right ) \right ) ^{3}}{3\,b}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [B] time = 1.39033, size = 45, normalized size = 2.81 \begin{align*} \frac{1}{3} \, b^{2} x^{3} - b x^{2} \operatorname{artanh}\left (\tanh \left (b x + a\right )\right ) + x \operatorname{artanh}\left (\tanh \left (b x + a\right )\right )^{2} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.51263, size = 42, normalized size = 2.62 \begin{align*} \frac{1}{3} \, b^{2} x^{3} + a b x^{2} + a^{2} x \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 2.31926, size = 20, normalized size = 1.25 \begin{align*} \begin{cases} \frac{\operatorname{atanh}^{3}{\left (\tanh{\left (a + b x \right )} \right )}}{3 b} & \text{for}\: b \neq 0 \\x \operatorname{atanh}^{2}{\left (\tanh{\left (a \right )} \right )} & \text{otherwise} \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.14693, size = 27, normalized size = 1.69 \begin{align*} \frac{1}{3} \, b^{2} x^{3} + a b x^{2} + a^{2} x \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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