Optimal. Leaf size=12 \[ -2 \tanh ^{-1}\left (\sqrt{e^x+1}\right ) \]
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Rubi [A] time = 0.0080599, antiderivative size = 12, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 9, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.333, Rules used = {2282, 63, 207} \[ -2 \tanh ^{-1}\left (\sqrt{e^x+1}\right ) \]
Antiderivative was successfully verified.
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Rule 2282
Rule 63
Rule 207
Rubi steps
\begin{align*} \int \frac{1}{\sqrt{1+e^x}} \, dx &=\operatorname{Subst}\left (\int \frac{1}{x \sqrt{1+x}} \, dx,x,e^x\right )\\ &=2 \operatorname{Subst}\left (\int \frac{1}{-1+x^2} \, dx,x,\sqrt{1+e^x}\right )\\ &=-2 \tanh ^{-1}\left (\sqrt{1+e^x}\right )\\ \end{align*}
Mathematica [A] time = 0.0032689, size = 12, normalized size = 1. \[ -2 \tanh ^{-1}\left (\sqrt{e^x+1}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.005, size = 10, normalized size = 0.8 \begin{align*} -2\,{\it Artanh} \left ( \sqrt{1+{{\rm e}^{x}}} \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [B] time = 0.935081, size = 28, normalized size = 2.33 \begin{align*} -\log \left (\sqrt{e^{x} + 1} + 1\right ) + \log \left (\sqrt{e^{x} + 1} - 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [B] time = 2.06284, size = 68, normalized size = 5.67 \begin{align*} -\log \left (\sqrt{e^{x} + 1} + 1\right ) + \log \left (\sqrt{e^{x} + 1} - 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [B] time = 1.04146, size = 26, normalized size = 2.17 \begin{align*} \log{\left (-1 + \frac{1}{\sqrt{e^{x} + 1}} \right )} - \log{\left (1 + \frac{1}{\sqrt{e^{x} + 1}} \right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [B] time = 1.05047, size = 28, normalized size = 2.33 \begin{align*} -\log \left (\sqrt{e^{x} + 1} + 1\right ) + \log \left (\sqrt{e^{x} + 1} - 1\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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