Optimal. Leaf size=14 \[ \tanh ^{-1}\left (\frac{x}{\sqrt{a^2+x^2}}\right ) \]
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Rubi [A] time = 0.0023598, antiderivative size = 14, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 11, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.182, Rules used = {217, 206} \[ \tanh ^{-1}\left (\frac{x}{\sqrt{a^2+x^2}}\right ) \]
Antiderivative was successfully verified.
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Rule 217
Rule 206
Rubi steps
\begin{align*} \int \frac{1}{\sqrt{a^2+x^2}} \, dx &=\operatorname{Subst}\left (\int \frac{1}{1-x^2} \, dx,x,\frac{x}{\sqrt{a^2+x^2}}\right )\\ &=\tanh ^{-1}\left (\frac{x}{\sqrt{a^2+x^2}}\right )\\ \end{align*}
Mathematica [B] time = 0.0025837, size = 42, normalized size = 3. \[ \frac{1}{2} \log \left (\frac{x}{\sqrt{a^2+x^2}}+1\right )-\frac{1}{2} \log \left (1-\frac{x}{\sqrt{a^2+x^2}}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.002, size = 13, normalized size = 0.9 \begin{align*} \ln \left ( x+\sqrt{{a}^{2}+{x}^{2}} \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 0.918816, size = 11, normalized size = 0.79 \begin{align*} \operatorname{arsinh}\left (\frac{x}{\sqrt{a^{2}}}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.02888, size = 38, normalized size = 2.71 \begin{align*} -\log \left (-x + \sqrt{a^{2} + x^{2}}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.938693, size = 3, normalized size = 0.21 \begin{align*} \operatorname{asinh}{\left (\frac{x}{a} \right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.06161, size = 22, normalized size = 1.57 \begin{align*} -\log \left (-x + \sqrt{a^{2} + x^{2}}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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