Optimal. Leaf size=27 \[ \frac {\text {ArcTan}\left (\frac {\sqrt {2} \tanh (x)}{\sqrt {-1-\tanh ^2(x)}}\right )}{\sqrt {2}} \]
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Rubi [A]
time = 0.01, antiderivative size = 27, normalized size of antiderivative = 1.00, number of steps
used = 3, number of rules used = 3, integrand size = 12, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {3742, 385, 209}
\begin {gather*} \frac {\text {ArcTan}\left (\frac {\sqrt {2} \tanh (x)}{\sqrt {-\tanh ^2(x)-1}}\right )}{\sqrt {2}} \end {gather*}
Antiderivative was successfully verified.
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Rule 209
Rule 385
Rule 3742
Rubi steps
\begin {align*} \int \frac {1}{\sqrt {-1-\tanh ^2(x)}} \, dx &=\text {Subst}\left (\int \frac {1}{\sqrt {-1-x^2} \left (1-x^2\right )} \, dx,x,\tanh (x)\right )\\ &=\text {Subst}\left (\int \frac {1}{1+2 x^2} \, dx,x,\frac {\tanh (x)}{\sqrt {-1-\tanh ^2(x)}}\right )\\ &=\frac {\tan ^{-1}\left (\frac {\sqrt {2} \tanh (x)}{\sqrt {-1-\tanh ^2(x)}}\right )}{\sqrt {2}}\\ \end {align*}
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Mathematica [A]
time = 0.02, size = 37, normalized size = 1.37 \begin {gather*} \frac {\sinh ^{-1}\left (\sqrt {2} \sinh (x)\right ) \sqrt {\cosh (2 x)} \text {sech}(x)}{\sqrt {2} \sqrt {-1-\tanh ^2(x)}} \end {gather*}
Antiderivative was successfully verified.
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Maple [B] Leaf count of result is larger than twice the leaf count of optimal. \(65\) vs.
\(2(22)=44\).
time = 0.96, size = 66, normalized size = 2.44
method | result | size |
derivativedivides | \(-\frac {\sqrt {2}\, \arctan \left (\frac {\left (-2-2 \tanh \left (x \right )\right ) \sqrt {2}}{4 \sqrt {-\left (\tanh \left (x \right )-1\right )^{2}-2 \tanh \left (x \right )}}\right )}{4}+\frac {\sqrt {2}\, \arctan \left (\frac {\left (-2+2 \tanh \left (x \right )\right ) \sqrt {2}}{4 \sqrt {-\left (1+\tanh \left (x \right )\right )^{2}+2 \tanh \left (x \right )}}\right )}{4}\) | \(66\) |
default | \(-\frac {\sqrt {2}\, \arctan \left (\frac {\left (-2-2 \tanh \left (x \right )\right ) \sqrt {2}}{4 \sqrt {-\left (\tanh \left (x \right )-1\right )^{2}-2 \tanh \left (x \right )}}\right )}{4}+\frac {\sqrt {2}\, \arctan \left (\frac {\left (-2+2 \tanh \left (x \right )\right ) \sqrt {2}}{4 \sqrt {-\left (1+\tanh \left (x \right )\right )^{2}+2 \tanh \left (x \right )}}\right )}{4}\) | \(66\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Failed to integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [C] Result contains complex when optimal does not.
time = 0.35, size = 175, normalized size = 6.48 \begin {gather*} \frac {1}{8} i \, \sqrt {2} \log \left (\frac {1}{2} \, {\left (i \, \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}{8} i \, \sqrt {2} \log \left (\frac {1}{2} \, {\left (-i \, \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}{8} i \, \sqrt {2} \log \left ({\left (\sqrt {-2 \, e^{\left (4 \, x\right )} - 2} {\left (e^{\left (2 \, x\right )} - 2\right )} + i \, \sqrt {2} e^{\left (4 \, x\right )} - i \, \sqrt {2} e^{\left (2 \, x\right )} + 2 i \, \sqrt {2}\right )} e^{\left (-4 \, x\right )}\right ) + \frac {1}{8} i \, \sqrt {2} \log \left ({\left (\sqrt {-2 \, e^{\left (4 \, x\right )} - 2} {\left (e^{\left (2 \, x\right )} - 2\right )} - i \, \sqrt {2} e^{\left (4 \, x\right )} + i \, \sqrt {2} e^{\left (2 \, x\right )} - 2 i \, \sqrt {2}\right )} e^{\left (-4 \, x\right )}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{\sqrt {- \tanh ^{2}{\left (x \right )} - 1}}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [C] Result contains complex when optimal does not.
time = 0.41, size = 58, normalized size = 2.15 \begin {gather*} \frac {1}{4} i \, \sqrt {2} {\left (\log \left (\sqrt {e^{\left (4 \, x\right )} + 1} - e^{\left (2 \, x\right )} + 1\right ) + \log \left (\sqrt {e^{\left (4 \, x\right )} + 1} - e^{\left (2 \, x\right )}\right ) - \log \left (-\sqrt {e^{\left (4 \, x\right )} + 1} + e^{\left (2 \, x\right )} + 1\right )\right )} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 1.20, size = 22, normalized size = 0.81 \begin {gather*} \frac {\sqrt {2}\,\mathrm {atan}\left (\frac {\sqrt {2}\,\mathrm {tanh}\left (x\right )}{\sqrt {-{\mathrm {tanh}\left (x\right )}^2-1}}\right )}{2} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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