Optimal. Leaf size=45 \[ \tan ^{-1}\left (\frac{\coth (x)}{\sqrt{-\coth ^2(x)-1}}\right )-\sqrt{2} \tan ^{-1}\left (\frac{\sqrt{2} \coth (x)}{\sqrt{-\coth ^2(x)-1}}\right ) \]
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Rubi [A] time = 0.0336847, antiderivative size = 45, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 5, integrand size = 12, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.417, Rules used = {3661, 402, 217, 203, 377} \[ \tan ^{-1}\left (\frac{\coth (x)}{\sqrt{-\coth ^2(x)-1}}\right )-\sqrt{2} \tan ^{-1}\left (\frac{\sqrt{2} \coth (x)}{\sqrt{-\coth ^2(x)-1}}\right ) \]
Antiderivative was successfully verified.
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Rule 3661
Rule 402
Rule 217
Rule 203
Rule 377
Rubi steps
\begin{align*} \int \sqrt{-1-\coth ^2(x)} \, dx &=\operatorname{Subst}\left (\int \frac{\sqrt{-1-x^2}}{1-x^2} \, dx,x,\coth (x)\right )\\ &=-\left (2 \operatorname{Subst}\left (\int \frac{1}{\sqrt{-1-x^2} \left (1-x^2\right )} \, dx,x,\coth (x)\right )\right )+\operatorname{Subst}\left (\int \frac{1}{\sqrt{-1-x^2}} \, dx,x,\coth (x)\right )\\ &=-\left (2 \operatorname{Subst}\left (\int \frac{1}{1+2 x^2} \, dx,x,\frac{\coth (x)}{\sqrt{-1-\coth ^2(x)}}\right )\right )+\operatorname{Subst}\left (\int \frac{1}{1+x^2} \, dx,x,\frac{\coth (x)}{\sqrt{-1-\coth ^2(x)}}\right )\\ &=\tan ^{-1}\left (\frac{\coth (x)}{\sqrt{-1-\coth ^2(x)}}\right )-\sqrt{2} \tan ^{-1}\left (\frac{\sqrt{2} \coth (x)}{\sqrt{-1-\coth ^2(x)}}\right )\\ \end{align*}
Mathematica [A] time = 0.0504301, size = 62, normalized size = 1.38 \[ \frac{\sinh (x) \sqrt{-\coth ^2(x)-1} \left (\sqrt{2} \log \left (\sqrt{2} \cosh (x)+\sqrt{\cosh (2 x)}\right )-\tanh ^{-1}\left (\frac{\cosh (x)}{\sqrt{\cosh (2 x)}}\right )\right )}{\sqrt{\cosh (2 x)}} \]
Antiderivative was successfully verified.
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Maple [B] time = 0.05, size = 142, normalized size = 3.2 \begin{align*}{\frac{1}{2}\sqrt{- \left ( 1+{\rm coth} \left (x\right ) \right ) ^{2}+2\,{\rm coth} \left (x\right )}}+{\frac{1}{2}\arctan \left ({{\rm coth} \left (x\right ){\frac{1}{\sqrt{- \left ( 1+{\rm coth} \left (x\right ) \right ) ^{2}+2\,{\rm coth} \left (x\right )}}}} \right ) }-{\frac{\sqrt{2}}{2}\arctan \left ({\frac{ \left ( 2\,{\rm coth} \left (x\right )-2 \right ) \sqrt{2}}{4}{\frac{1}{\sqrt{- \left ( 1+{\rm coth} \left (x\right ) \right ) ^{2}+2\,{\rm coth} \left (x\right )}}}} \right ) }-{\frac{1}{2}\sqrt{- \left ({\rm coth} \left (x\right )-1 \right ) ^{2}-2\,{\rm coth} \left (x\right )}}+{\frac{1}{2}\arctan \left ({{\rm coth} \left (x\right ){\frac{1}{\sqrt{- \left ({\rm coth} \left (x\right )-1 \right ) ^{2}-2\,{\rm coth} \left (x\right )}}}} \right ) }+{\frac{\sqrt{2}}{2}\arctan \left ({\frac{ \left ( -2-2\,{\rm coth} \left (x\right ) \right ) \sqrt{2}}{4}{\frac{1}{\sqrt{- \left ({\rm coth} \left (x\right )-1 \right ) ^{2}-2\,{\rm coth} \left (x\right )}}}} \right ) } \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \sqrt{-\coth \left (x\right )^{2} - 1}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [C] time = 2.52965, size = 710, normalized size = 15.78 \begin{align*} -\frac{1}{4} \, \sqrt{-2} \log \left (-{\left (\sqrt{-2} \sqrt{-2 \, e^{\left (4 \, x\right )} - 2} + 2 \, e^{\left (2 \, x\right )} - 2\right )} e^{\left (-2 \, x\right )}\right ) + \frac{1}{4} \, \sqrt{-2} \log \left ({\left (\sqrt{-2} \sqrt{-2 \, e^{\left (4 \, x\right )} - 2} - 2 \, e^{\left (2 \, x\right )} + 2\right )} e^{\left (-2 \, x\right )}\right ) + \frac{1}{4} \, \sqrt{-2} \log \left (-2 \,{\left (\sqrt{-2 \, e^{\left (4 \, x\right )} - 2}{\left (e^{\left (2 \, x\right )} + 2\right )} + \sqrt{-2} e^{\left (4 \, x\right )} + \sqrt{-2} e^{\left (2 \, x\right )} + 2 \, \sqrt{-2}\right )} e^{\left (-4 \, x\right )}\right ) - \frac{1}{4} \, \sqrt{-2} \log \left (-2 \,{\left (\sqrt{-2 \, e^{\left (4 \, x\right )} - 2}{\left (e^{\left (2 \, x\right )} + 2\right )} - \sqrt{-2} e^{\left (4 \, x\right )} - \sqrt{-2} e^{\left (2 \, x\right )} - 2 \, \sqrt{-2}\right )} e^{\left (-4 \, x\right )}\right ) - \frac{1}{2} i \, \log \left ({\left (4 i \, \sqrt{-2 \, e^{\left (4 \, x\right )} - 2} - 4 \, e^{\left (2 \, x\right )} - 4\right )} e^{\left (-2 \, x\right )}\right ) + \frac{1}{2} i \, \log \left ({\left (-4 i \, \sqrt{-2 \, e^{\left (4 \, x\right )} - 2} - 4 \, e^{\left (2 \, x\right )} - 4\right )} e^{\left (-2 \, 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 \sqrt{- \coth ^{2}{\left (x \right )} - 1}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [C] time = 1.23223, size = 167, normalized size = 3.71 \begin{align*} -\frac{1}{2} \, \sqrt{2}{\left (i \, \sqrt{2} \log \left (\frac{{\left | -2 \, \sqrt{2} + 2 \, \sqrt{e^{\left (4 \, x\right )} + 1} - 2 \, e^{\left (2 \, x\right )} + 2 \right |}}{2 \,{\left (\sqrt{2} + \sqrt{e^{\left (4 \, x\right )} + 1} - e^{\left (2 \, x\right )} + 1\right )}}\right ) + i \, \log \left (\sqrt{e^{\left (4 \, x\right )} + 1} - e^{\left (2 \, x\right )} + 1\right ) - i \, \log \left (\sqrt{e^{\left (4 \, x\right )} + 1} - e^{\left (2 \, x\right )}\right ) - i \, \log \left (-\sqrt{e^{\left (4 \, x\right )} + 1} + e^{\left (2 \, x\right )} + 1\right )\right )} \mathrm{sgn}\left (-e^{\left (2 \, x\right )} + 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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