Optimal. Leaf size=20 \[ -\frac{1}{3} \tanh ^{-1}\left (\frac{1}{3} \sqrt{4 x^2+9}\right ) \]
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Rubi [A] time = 0.0100864, antiderivative size = 20, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.2, Rules used = {266, 63, 207} \[ -\frac{1}{3} \tanh ^{-1}\left (\frac{1}{3} \sqrt{4 x^2+9}\right ) \]
Antiderivative was successfully verified.
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Rule 266
Rule 63
Rule 207
Rubi steps
\begin{align*} \int \frac{1}{x \sqrt{9+4 x^2}} \, dx &=\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{x \sqrt{9+4 x}} \, dx,x,x^2\right )\\ &=\frac{1}{4} \operatorname{Subst}\left (\int \frac{1}{-\frac{9}{4}+\frac{x^2}{4}} \, dx,x,\sqrt{9+4 x^2}\right )\\ &=-\frac{1}{3} \tanh ^{-1}\left (\frac{1}{3} \sqrt{9+4 x^2}\right )\\ \end{align*}
Mathematica [A] time = 0.0024164, size = 20, normalized size = 1. \[ -\frac{1}{3} \tanh ^{-1}\left (\frac{1}{3} \sqrt{4 x^2+9}\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 15, normalized size = 0.8 \begin{align*} -{\frac{1}{3}{\it Artanh} \left ( 3\,{\frac{1}{\sqrt{4\,{x}^{2}+9}}} \right ) } \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 2.99021, size = 12, normalized size = 0.6 \begin{align*} -\frac{1}{3} \, \operatorname{arsinh}\left (\frac{3}{2 \,{\left | x \right |}}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [B] time = 1.24206, size = 103, normalized size = 5.15 \begin{align*} -\frac{1}{3} \, \log \left (-2 \, x + \sqrt{4 \, x^{2} + 9} + 3\right ) + \frac{1}{3} \, \log \left (-2 \, x + \sqrt{4 \, x^{2} + 9} - 3\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.997542, size = 8, normalized size = 0.4 \begin{align*} - \frac{\operatorname{asinh}{\left (\frac{3}{2 x} \right )}}{3} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [B] time = 2.20068, size = 39, normalized size = 1.95 \begin{align*} -\frac{1}{6} \, \log \left (\sqrt{4 \, x^{2} + 9} + 3\right ) + \frac{1}{6} \, \log \left (\sqrt{4 \, x^{2} + 9} - 3\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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