Optimal. Leaf size=16 \[ \tanh ^{-1}\left (\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right ) \]
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Rubi [A]
time = 0.02, antiderivative size = 16, normalized size of antiderivative = 1.00, number of steps
used = 3, number of rules used = 2, integrand size = 16, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.125, Rules used = {223, 212}
\begin {gather*} \tanh ^{-1}\left (\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right ) \end {gather*}
Antiderivative was successfully verified.
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Rule 212
Rule 223
Rubi steps
\begin {align*} \int \frac {1}{x \sqrt {a^2+\log ^2(x)}} \, dx &=\text {Subst}\left (\int \frac {1}{\sqrt {a^2+x^2}} \, dx,x,\log (x)\right )\\ &=\text {Subst}\left (\int \frac {1}{1-x^2} \, dx,x,\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right )\\ &=\tanh ^{-1}\left (\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right )\\ \end {align*}
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Mathematica [B] Leaf count is larger than twice the leaf count of optimal. \(46\) vs. \(2(16)=32\).
time = 0.01, size = 46, normalized size = 2.88 \begin {gather*} -\frac {1}{2} \log \left (1-\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right )+\frac {1}{2} \log \left (1+\frac {\log (x)}{\sqrt {a^2+\log ^2(x)}}\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [A]
time = 0.02, size = 15, normalized size = 0.94
method | result | size |
derivativedivides | \(\ln \left (\ln \left (x \right )+\sqrt {a^{2}+\ln \left (x \right )^{2}}\right )\) | \(15\) |
default | \(\ln \left (\ln \left (x \right )+\sqrt {a^{2}+\ln \left (x \right )^{2}}\right )\) | \(15\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 1.60, size = 7, normalized size = 0.44 \begin {gather*} \operatorname {arsinh}\left (\frac {\log \left (x\right )}{a}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A]
time = 0.74, size = 18, normalized size = 1.12 \begin {gather*} -\log \left (\sqrt {a^{2} + \log \left (x\right )^{2}} - \log \left (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}{x \sqrt {a^{2} + \log {\left (x \right )}^{2}}}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A]
time = 1.34, size = 18, normalized size = 1.12 \begin {gather*} -\log \left (\sqrt {a^{2} + \log \left (x\right )^{2}} - \log \left (x\right )\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 0.43, size = 14, normalized size = 0.88 \begin {gather*} \ln \left (\ln \left (x\right )+\sqrt {a^2+{\ln \left (x\right )}^2}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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