Integrand size = 13, antiderivative size = 64 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=-\frac {b x}{a^2-b^2}+\frac {a \log (\cosh (x))}{a^2-b^2}+\frac {a^3 \log (a+b \tanh (x))}{b^2 \left (a^2-b^2\right )}-\frac {\tanh (x)}{b} \]
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Time = 0.10 (sec) , antiderivative size = 64, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.385, Rules used = {3647, 3707, 3698, 31, 3556} \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=-\frac {b x}{a^2-b^2}+\frac {a \log (\cosh (x))}{a^2-b^2}+\frac {a^3 \log (a+b \tanh (x))}{b^2 \left (a^2-b^2\right )}-\frac {\tanh (x)}{b} \]
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Rule 31
Rule 3556
Rule 3647
Rule 3698
Rule 3707
Rubi steps \begin{align*} \text {integral}& = -\frac {\tanh (x)}{b}-\frac {\int \frac {-a-b \tanh (x)+a \tanh ^2(x)}{a+b \tanh (x)} \, dx}{b} \\ & = -\frac {b x}{a^2-b^2}-\frac {\tanh (x)}{b}+\frac {a \int \tanh (x) \, dx}{a^2-b^2}+\frac {a^3 \int \frac {1-\tanh ^2(x)}{a+b \tanh (x)} \, dx}{b \left (a^2-b^2\right )} \\ & = -\frac {b x}{a^2-b^2}+\frac {a \log (\cosh (x))}{a^2-b^2}-\frac {\tanh (x)}{b}+\frac {a^3 \text {Subst}\left (\int \frac {1}{a+x} \, dx,x,b \tanh (x)\right )}{b^2 \left (a^2-b^2\right )} \\ & = -\frac {b x}{a^2-b^2}+\frac {a \log (\cosh (x))}{a^2-b^2}+\frac {a^3 \log (a+b \tanh (x))}{b^2 \left (a^2-b^2\right )}-\frac {\tanh (x)}{b} \\ \end{align*}
Time = 0.27 (sec) , antiderivative size = 65, normalized size of antiderivative = 1.02 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=-\frac {\log (1-\tanh (x))}{2 (a+b)}-\frac {\log (1+\tanh (x))}{2 (a-b)}+\frac {a^3 \log (a+b \tanh (x))}{b^2 \left (a^2-b^2\right )}-\frac {\tanh (x)}{b} \]
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Time = 0.07 (sec) , antiderivative size = 67, normalized size of antiderivative = 1.05
method | result | size |
derivativedivides | \(-\frac {\tanh \left (x \right )}{b}-\frac {\ln \left (1+\tanh \left (x \right )\right )}{2 a -2 b}+\frac {a^{3} \ln \left (a +b \tanh \left (x \right )\right )}{b^{2} \left (a +b \right ) \left (a -b \right )}-\frac {\ln \left (\tanh \left (x \right )-1\right )}{2 a +2 b}\) | \(67\) |
default | \(-\frac {\tanh \left (x \right )}{b}-\frac {\ln \left (1+\tanh \left (x \right )\right )}{2 a -2 b}+\frac {a^{3} \ln \left (a +b \tanh \left (x \right )\right )}{b^{2} \left (a +b \right ) \left (a -b \right )}-\frac {\ln \left (\tanh \left (x \right )-1\right )}{2 a +2 b}\) | \(67\) |
parallelrisch | \(-\frac {\ln \left (1-\tanh \left (x \right )\right ) a \,b^{2}-a^{3} \ln \left (a +b \tanh \left (x \right )\right )+a \,b^{2} x +b^{3} x +\tanh \left (x \right ) a^{2} b -\tanh \left (x \right ) b^{3}}{b^{2} \left (a^{2}-b^{2}\right )}\) | \(67\) |
risch | \(\frac {x}{a +b}-\frac {2 a^{3} x}{b^{2} \left (a^{2}-b^{2}\right )}+\frac {2 a x}{b^{2}}+\frac {2}{b \left (1+{\mathrm e}^{2 x}\right )}+\frac {a^{3} \ln \left ({\mathrm e}^{2 x}+\frac {a -b}{a +b}\right )}{b^{2} \left (a^{2}-b^{2}\right )}-\frac {a \ln \left (1+{\mathrm e}^{2 x}\right )}{b^{2}}\) | \(97\) |
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Leaf count of result is larger than twice the leaf count of optimal. 264 vs. \(2 (64) = 128\).
Time = 0.26 (sec) , antiderivative size = 264, normalized size of antiderivative = 4.12 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=-\frac {{\left (a b^{2} + b^{3}\right )} x \cosh \left (x\right )^{2} + 2 \, {\left (a b^{2} + b^{3}\right )} x \cosh \left (x\right ) \sinh \left (x\right ) + {\left (a b^{2} + b^{3}\right )} x \sinh \left (x\right )^{2} - 2 \, a^{2} b + 2 \, b^{3} + {\left (a b^{2} + b^{3}\right )} x - {\left (a^{3} \cosh \left (x\right )^{2} + 2 \, a^{3} \cosh \left (x\right ) \sinh \left (x\right ) + a^{3} \sinh \left (x\right )^{2} + a^{3}\right )} \log \left (\frac {2 \, {\left (a \cosh \left (x\right ) + b \sinh \left (x\right )\right )}}{\cosh \left (x\right ) - \sinh \left (x\right )}\right ) + {\left (a^{3} - a b^{2} + {\left (a^{3} - a b^{2}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (a^{3} - a b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right ) + {\left (a^{3} - a b^{2}\right )} \sinh \left (x\right )^{2}\right )} \log \left (\frac {2 \, \cosh \left (x\right )}{\cosh \left (x\right ) - \sinh \left (x\right )}\right )}{a^{2} b^{2} - b^{4} + {\left (a^{2} b^{2} - b^{4}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (a^{2} b^{2} - b^{4}\right )} \cosh \left (x\right ) \sinh \left (x\right ) + {\left (a^{2} b^{2} - b^{4}\right )} \sinh \left (x\right )^{2}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 330 vs. \(2 (49) = 98\).
Time = 0.31 (sec) , antiderivative size = 330, normalized size of antiderivative = 5.16 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=\begin {cases} \tilde {\infty } \left (x - \tanh {\left (x \right )}\right ) & \text {for}\: a = 0 \wedge b = 0 \\\frac {x - \log {\left (\tanh {\left (x \right )} + 1 \right )} - \frac {\tanh ^{2}{\left (x \right )}}{2}}{a} & \text {for}\: b = 0 \\\frac {5 x \tanh {\left (x \right )}}{2 b \tanh {\left (x \right )} - 2 b} - \frac {5 x}{2 b \tanh {\left (x \right )} - 2 b} - \frac {2 \log {\left (\tanh {\left (x \right )} + 1 \right )} \tanh {\left (x \right )}}{2 b \tanh {\left (x \right )} - 2 b} + \frac {2 \log {\left (\tanh {\left (x \right )} + 1 \right )}}{2 b \tanh {\left (x \right )} - 2 b} - \frac {2 \tanh ^{2}{\left (x \right )}}{2 b \tanh {\left (x \right )} - 2 b} + \frac {3}{2 b \tanh {\left (x \right )} - 2 b} & \text {for}\: a = - b \\\frac {x \tanh {\left (x \right )}}{2 b \tanh {\left (x \right )} + 2 b} + \frac {x}{2 b \tanh {\left (x \right )} + 2 b} + \frac {2 \log {\left (\tanh {\left (x \right )} + 1 \right )} \tanh {\left (x \right )}}{2 b \tanh {\left (x \right )} + 2 b} + \frac {2 \log {\left (\tanh {\left (x \right )} + 1 \right )}}{2 b \tanh {\left (x \right )} + 2 b} - \frac {2 \tanh ^{2}{\left (x \right )}}{2 b \tanh {\left (x \right )} + 2 b} + \frac {3}{2 b \tanh {\left (x \right )} + 2 b} & \text {for}\: a = b \\\frac {a^{3} \log {\left (\frac {a}{b} + \tanh {\left (x \right )} \right )}}{a^{2} b^{2} - b^{4}} - \frac {a^{2} b \tanh {\left (x \right )}}{a^{2} b^{2} - b^{4}} + \frac {a b^{2} x}{a^{2} b^{2} - b^{4}} - \frac {a b^{2} \log {\left (\tanh {\left (x \right )} + 1 \right )}}{a^{2} b^{2} - b^{4}} - \frac {b^{3} x}{a^{2} b^{2} - b^{4}} + \frac {b^{3} \tanh {\left (x \right )}}{a^{2} b^{2} - b^{4}} & \text {otherwise} \end {cases} \]
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Time = 0.29 (sec) , antiderivative size = 71, normalized size of antiderivative = 1.11 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=\frac {a^{3} \log \left (-{\left (a - b\right )} e^{\left (-2 \, x\right )} - a - b\right )}{a^{2} b^{2} - b^{4}} + \frac {x}{a + b} - \frac {a \log \left (e^{\left (-2 \, x\right )} + 1\right )}{b^{2}} - \frac {2}{b e^{\left (-2 \, x\right )} + b} \]
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Time = 0.26 (sec) , antiderivative size = 75, normalized size of antiderivative = 1.17 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=\frac {a^{3} \log \left ({\left | a e^{\left (2 \, x\right )} + b e^{\left (2 \, x\right )} + a - b \right |}\right )}{a^{2} b^{2} - b^{4}} - \frac {x}{a - b} - \frac {a \log \left (e^{\left (2 \, x\right )} + 1\right )}{b^{2}} + \frac {2}{b {\left (e^{\left (2 \, x\right )} + 1\right )}} \]
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Time = 0.13 (sec) , antiderivative size = 59, normalized size of antiderivative = 0.92 \[ \int \frac {\tanh ^3(x)}{a+b \tanh (x)} \, dx=\frac {x}{a+b}-\frac {\mathrm {tanh}\left (x\right )}{b}-\frac {a\,\ln \left (\mathrm {tanh}\left (x\right )+1\right )}{a^2-b^2}+\frac {a^3\,\ln \left (a+b\,\mathrm {tanh}\left (x\right )\right )}{b^2\,\left (a^2-b^2\right )} \]
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