Optimal. Leaf size=41 \[ \frac{1}{2} \text{PolyLog}\left (2,-e^{2 x}\right )-\frac{1}{2} \text{PolyLog}\left (2,e^{2 x}\right )+x \log (a \tanh (x))+2 x \tanh ^{-1}\left (e^{2 x}\right ) \]
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Rubi [A] time = 0.0442116, antiderivative size = 41, normalized size of antiderivative = 1., number of steps used = 7, number of rules used = 5, integrand size = 5, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 1., Rules used = {2548, 5461, 4182, 2279, 2391} \[ \frac{1}{2} \text{PolyLog}\left (2,-e^{2 x}\right )-\frac{1}{2} \text{PolyLog}\left (2,e^{2 x}\right )+x \log (a \tanh (x))+2 x \tanh ^{-1}\left (e^{2 x}\right ) \]
Antiderivative was successfully verified.
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Rule 2548
Rule 5461
Rule 4182
Rule 2279
Rule 2391
Rubi steps
\begin{align*} \int \log (a \tanh (x)) \, dx &=x \log (a \tanh (x))-\int x \text{csch}(x) \text{sech}(x) \, dx\\ &=x \log (a \tanh (x))-2 \int x \text{csch}(2 x) \, dx\\ &=2 x \tanh ^{-1}\left (e^{2 x}\right )+x \log (a \tanh (x))+\int \log \left (1-e^{2 x}\right ) \, dx-\int \log \left (1+e^{2 x}\right ) \, dx\\ &=2 x \tanh ^{-1}\left (e^{2 x}\right )+x \log (a \tanh (x))+\frac{1}{2} \operatorname{Subst}\left (\int \frac{\log (1-x)}{x} \, dx,x,e^{2 x}\right )-\frac{1}{2} \operatorname{Subst}\left (\int \frac{\log (1+x)}{x} \, dx,x,e^{2 x}\right )\\ &=2 x \tanh ^{-1}\left (e^{2 x}\right )+x \log (a \tanh (x))+\frac{1}{2} \text{Li}_2\left (-e^{2 x}\right )-\frac{\text{Li}_2\left (e^{2 x}\right )}{2}\\ \end{align*}
Mathematica [A] time = 0.0074158, size = 49, normalized size = 1.2 \[ \frac{1}{2} \text{PolyLog}(2,-\tanh (x))-\frac{1}{2} \text{PolyLog}(2,\tanh (x))-\frac{1}{2} \log (1-\tanh (x)) \log (a \tanh (x))+\frac{1}{2} \log (\tanh (x)+1) \log (a \tanh (x)) \]
Antiderivative was successfully verified.
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Maple [B] time = 0.027, size = 70, normalized size = 1.7 \begin{align*}{\frac{\ln \left ( a\tanh \left ( x \right ) \right ) }{2}\ln \left ({\frac{a\tanh \left ( x \right ) +a}{a}} \right ) }+{\frac{1}{2}{\it dilog} \left ({\frac{a\tanh \left ( x \right ) +a}{a}} \right ) }-{\frac{\ln \left ( a\tanh \left ( x \right ) \right ) }{2}\ln \left ( -{\frac{a\tanh \left ( x \right ) -a}{a}} \right ) }-{\frac{1}{2}{\it dilog} \left ( -{\frac{a\tanh \left ( x \right ) -a}{a}} \right ) } \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.59943, size = 76, normalized size = 1.85 \begin{align*} x \log \left (a \tanh \left (x\right )\right ) + x \log \left (e^{\left (2 \, x\right )} + 1\right ) - x \log \left (e^{x} + 1\right ) - x \log \left (-e^{x} + 1\right ) + \frac{1}{2} \,{\rm Li}_2\left (-e^{\left (2 \, x\right )}\right ) -{\rm Li}_2\left (-e^{x}\right ) -{\rm Li}_2\left (e^{x}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [C] time = 2.03789, size = 375, normalized size = 9.15 \begin{align*} x \log \left (\frac{a \sinh \left (x\right )}{\cosh \left (x\right )}\right ) - x \log \left (\cosh \left (x\right ) + \sinh \left (x\right ) + 1\right ) + x \log \left (i \, \cosh \left (x\right ) + i \, \sinh \left (x\right ) + 1\right ) + x \log \left (-i \, \cosh \left (x\right ) - i \, \sinh \left (x\right ) + 1\right ) - x \log \left (-\cosh \left (x\right ) - \sinh \left (x\right ) + 1\right ) -{\rm Li}_2\left (\cosh \left (x\right ) + \sinh \left (x\right )\right ) +{\rm Li}_2\left (i \, \cosh \left (x\right ) + i \, \sinh \left (x\right )\right ) +{\rm Li}_2\left (-i \, \cosh \left (x\right ) - i \, \sinh \left (x\right )\right ) -{\rm Li}_2\left (-\cosh \left (x\right ) - \sinh \left (x\right )\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \log{\left (a \tanh{\left (x \right )} \right )}\, dx \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 \log \left (a \tanh \left (x\right )\right )\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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