Integrand size = 13, antiderivative size = 40 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=-\frac {\left (a^2-b^2\right ) \log (a+b \tanh (x))}{b^3}+\frac {a \tanh (x)}{b^2}-\frac {\tanh ^2(x)}{2 b} \]
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Time = 0.05 (sec) , antiderivative size = 40, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.154, Rules used = {3587, 711} \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=-\frac {\left (a^2-b^2\right ) \log (a+b \tanh (x))}{b^3}+\frac {a \tanh (x)}{b^2}-\frac {\tanh ^2(x)}{2 b} \]
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Rule 711
Rule 3587
Rubi steps \begin{align*} \text {integral}& = \frac {\text {Subst}\left (\int \frac {1-\frac {x^2}{b^2}}{a+x} \, dx,x,b \tanh (x)\right )}{b} \\ & = \frac {\text {Subst}\left (\int \left (\frac {a}{b^2}-\frac {x}{b^2}+\frac {-a^2+b^2}{b^2 (a+x)}\right ) \, dx,x,b \tanh (x)\right )}{b} \\ & = -\frac {\left (a^2-b^2\right ) \log (a+b \tanh (x))}{b^3}+\frac {a \tanh (x)}{b^2}-\frac {\tanh ^2(x)}{2 b} \\ \end{align*}
Time = 0.10 (sec) , antiderivative size = 41, normalized size of antiderivative = 1.02 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=\frac {2 \left (-a^2+b^2\right ) \log (a+b \tanh (x))+2 a b \tanh (x)-b^2 \tanh ^2(x)}{2 b^3} \]
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Leaf count of result is larger than twice the leaf count of optimal. \(98\) vs. \(2(38)=76\).
Time = 12.04 (sec) , antiderivative size = 99, normalized size of antiderivative = 2.48
method | result | size |
default | \(\frac {\frac {2 \left (a b \tanh \left (\frac {x}{2}\right )^{3}-\tanh \left (\frac {x}{2}\right )^{2} b^{2}+a b \tanh \left (\frac {x}{2}\right )\right )}{\left (1+\tanh \left (\frac {x}{2}\right )^{2}\right )^{2}}+\left (a^{2}-b^{2}\right ) \ln \left (1+\tanh \left (\frac {x}{2}\right )^{2}\right )}{b^{3}}-\frac {\left (a^{2}-b^{2}\right ) \ln \left (\tanh \left (\frac {x}{2}\right )^{2} a +2 b \tanh \left (\frac {x}{2}\right )+a \right )}{b^{3}}\) | \(99\) |
risch | \(-\frac {2 \left (a \,{\mathrm e}^{2 x}-b \,{\mathrm e}^{2 x}+a \right )}{\left (1+{\mathrm e}^{2 x}\right )^{2} b^{2}}+\frac {\ln \left (1+{\mathrm e}^{2 x}\right ) a^{2}}{b^{3}}-\frac {\ln \left (1+{\mathrm e}^{2 x}\right )}{b}-\frac {\ln \left ({\mathrm e}^{2 x}+\frac {a -b}{a +b}\right ) a^{2}}{b^{3}}+\frac {\ln \left ({\mathrm e}^{2 x}+\frac {a -b}{a +b}\right )}{b}\) | \(102\) |
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Leaf count of result is larger than twice the leaf count of optimal. 430 vs. \(2 (38) = 76\).
Time = 0.26 (sec) , antiderivative size = 430, normalized size of antiderivative = 10.75 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=-\frac {2 \, {\left (a b - b^{2}\right )} \cosh \left (x\right )^{2} + 4 \, {\left (a b - b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right ) + 2 \, {\left (a b - b^{2}\right )} \sinh \left (x\right )^{2} + 2 \, a b + {\left ({\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{4} + 4 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right )^{3} + {\left (a^{2} - b^{2}\right )} \sinh \left (x\right )^{4} + 2 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (3 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{2} + a^{2} - b^{2}\right )} \sinh \left (x\right )^{2} + a^{2} - b^{2} + 4 \, {\left ({\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{3} + {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )\right )} \sinh \left (x\right )\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 ({\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{4} + 4 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right )^{3} + {\left (a^{2} - b^{2}\right )} \sinh \left (x\right )^{4} + 2 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (3 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{2} + a^{2} - b^{2}\right )} \sinh \left (x\right )^{2} + a^{2} - b^{2} + 4 \, {\left ({\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{3} + {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )\right )} \sinh \left (x\right )\right )} \log \left (\frac {2 \, \cosh \left (x\right )}{\cosh \left (x\right ) - \sinh \left (x\right )}\right )}{b^{3} \cosh \left (x\right )^{4} + 4 \, b^{3} \cosh \left (x\right ) \sinh \left (x\right )^{3} + b^{3} \sinh \left (x\right )^{4} + 2 \, b^{3} \cosh \left (x\right )^{2} + b^{3} + 2 \, {\left (3 \, b^{3} \cosh \left (x\right )^{2} + b^{3}\right )} \sinh \left (x\right )^{2} + 4 \, {\left (b^{3} \cosh \left (x\right )^{3} + b^{3} \cosh \left (x\right )\right )} \sinh \left (x\right )} \]
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\[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=\int \frac {\operatorname {sech}^{4}{\left (x \right )}}{a + b \tanh {\left (x \right )}}\, dx \]
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Leaf count of result is larger than twice the leaf count of optimal. 89 vs. \(2 (38) = 76\).
Time = 0.28 (sec) , antiderivative size = 89, normalized size of antiderivative = 2.22 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=\frac {2 \, {\left ({\left (a + b\right )} e^{\left (-2 \, x\right )} + a\right )}}{2 \, b^{2} e^{\left (-2 \, x\right )} + b^{2} e^{\left (-4 \, x\right )} + b^{2}} - \frac {{\left (a^{2} - b^{2}\right )} \log \left (-{\left (a - b\right )} e^{\left (-2 \, x\right )} - a - b\right )}{b^{3}} + \frac {{\left (a^{2} - b^{2}\right )} \log \left (e^{\left (-2 \, x\right )} + 1\right )}{b^{3}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 104 vs. \(2 (38) = 76\).
Time = 0.26 (sec) , antiderivative size = 104, normalized size of antiderivative = 2.60 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=-\frac {{\left (a^{3} + a^{2} b - a b^{2} - b^{3}\right )} \log \left ({\left | a e^{\left (2 \, x\right )} + b e^{\left (2 \, x\right )} + a - b \right |}\right )}{a b^{3} + b^{4}} + \frac {{\left (a^{2} - b^{2}\right )} \log \left (e^{\left (2 \, x\right )} + 1\right )}{b^{3}} - \frac {2 \, {\left (a b + {\left (a b - b^{2}\right )} e^{\left (2 \, x\right )}\right )}}{b^{3} {\left (e^{\left (2 \, x\right )} + 1\right )}^{2}} \]
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Time = 1.89 (sec) , antiderivative size = 88, normalized size of antiderivative = 2.20 \[ \int \frac {\text {sech}^4(x)}{a+b \tanh (x)} \, dx=\frac {\ln \left ({\mathrm {e}}^{2\,x}+1\right )\,\left (a+b\right )\,\left (a-b\right )}{b^3}-\frac {2\,\left (a-b\right )}{b^2\,\left ({\mathrm {e}}^{2\,x}+1\right )}-\frac {\ln \left (a-b+a\,{\mathrm {e}}^{2\,x}+b\,{\mathrm {e}}^{2\,x}\right )\,\left (a+b\right )\,\left (a-b\right )}{b^3}-\frac {2}{b\,\left (2\,{\mathrm {e}}^{2\,x}+{\mathrm {e}}^{4\,x}+1\right )} \]
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