Optimal. Leaf size=26 \[ \sqrt{e^{2 x}-1}-\tan ^{-1}\left (\sqrt{e^{2 x}-1}\right ) \]
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Rubi [A] time = 0.0119735, antiderivative size = 26, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 11, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.364, Rules used = {2282, 50, 63, 203} \[ \sqrt{e^{2 x}-1}-\tan ^{-1}\left (\sqrt{e^{2 x}-1}\right ) \]
Antiderivative was successfully verified.
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Rule 2282
Rule 50
Rule 63
Rule 203
Rubi steps
\begin{align*} \int \sqrt{-1+e^{2 x}} \, dx &=\frac{1}{2} \operatorname{Subst}\left (\int \frac{\sqrt{-1+x}}{x} \, dx,x,e^{2 x}\right )\\ &=\sqrt{-1+e^{2 x}}-\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{\sqrt{-1+x} x} \, dx,x,e^{2 x}\right )\\ &=\sqrt{-1+e^{2 x}}-\operatorname{Subst}\left (\int \frac{1}{1+x^2} \, dx,x,\sqrt{-1+e^{2 x}}\right )\\ &=\sqrt{-1+e^{2 x}}-\tan ^{-1}\left (\sqrt{-1+e^{2 x}}\right )\\ \end{align*}
Mathematica [A] time = 0.0061245, size = 26, normalized size = 1. \[ \sqrt{e^{2 x}-1}-\tan ^{-1}\left (\sqrt{e^{2 x}-1}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 21, normalized size = 0.8 \begin{align*} -\arctan \left ( \sqrt{-1+{{\rm e}^{2\,x}}} \right ) +\sqrt{-1+{{\rm e}^{2\,x}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.41183, size = 27, normalized size = 1.04 \begin{align*} \sqrt{e^{\left (2 \, x\right )} - 1} - \arctan \left (\sqrt{e^{\left (2 \, x\right )} - 1}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.86274, size = 63, normalized size = 2.42 \begin{align*} \sqrt{e^{\left (2 \, x\right )} - 1} - \arctan \left (\sqrt{e^{\left (2 \, x\right )} - 1}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 1.0767, size = 19, normalized size = 0.73 \begin{align*} \begin{cases} \sqrt{e^{2 x} - 1} - \operatorname{acos}{\left (e^{- x} \right )} & \text{for}\: e^{x} < 0 \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.06856, size = 27, normalized size = 1.04 \begin{align*} \sqrt{e^{\left (2 \, x\right )} - 1} - \arctan \left (\sqrt{e^{\left (2 \, x\right )} - 1}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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