Optimal. Leaf size=23 \[ -2 x+2 a \tan ^{-1}\left (\frac {x}{a}\right )+x \log \left (a^2+x^2\right ) \]
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Rubi [A]
time = 0.01, antiderivative size = 23, normalized size of antiderivative = 1.00, number of steps
used = 3, number of rules used = 3, integrand size = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {2498, 327, 209}
\begin {gather*} x \log \left (a^2+x^2\right )+2 a \text {ArcTan}\left (\frac {x}{a}\right )-2 x \end {gather*}
Antiderivative was successfully verified.
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Rule 209
Rule 327
Rule 2498
Rubi steps
\begin {align*} \int \log \left (a^2+x^2\right ) \, dx &=x \log \left (a^2+x^2\right )-2 \int \frac {x^2}{a^2+x^2} \, dx\\ &=-2 x+x \log \left (a^2+x^2\right )+\left (2 a^2\right ) \int \frac {1}{a^2+x^2} \, dx\\ &=-2 x+2 a \tan ^{-1}\left (\frac {x}{a}\right )+x \log \left (a^2+x^2\right )\\ \end {align*}
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Mathematica [A]
time = 0.00, size = 23, normalized size = 1.00 \begin {gather*} -2 x+2 a \tan ^{-1}\left (\frac {x}{a}\right )+x \log \left (a^2+x^2\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [A]
time = 0.02, size = 24, normalized size = 1.04
method | result | size |
default | \(-2 x +2 a \arctan \left (\frac {x}{a}\right )+x \ln \left (a^{2}+x^{2}\right )\) | \(24\) |
risch | \(-2 x +2 a \arctan \left (\frac {x}{a}\right )+x \ln \left (a^{2}+x^{2}\right )\) | \(24\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 5.41, size = 23, normalized size = 1.00 \begin {gather*} 2 \, a \arctan \left (\frac {x}{a}\right ) + x \log \left (a^{2} + x^{2}\right ) - 2 \, x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A]
time = 0.66, size = 23, normalized size = 1.00 \begin {gather*} 2 \, a \arctan \left (\frac {x}{a}\right ) + x \log \left (a^{2} + x^{2}\right ) - 2 \, x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [C] Result contains complex when optimal does not.
time = 0.06, size = 36, normalized size = 1.57 \begin {gather*} - 2 a \left (\frac {i \log {\left (- i a + x \right )}}{2} - \frac {i \log {\left (i a + x \right )}}{2}\right ) + x \log {\left (a^{2} + x^{2} \right )} - 2 x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A]
time = 1.20, size = 23, normalized size = 1.00 \begin {gather*} 2 \, a \arctan \left (\frac {x}{a}\right ) + x \log \left (a^{2} + x^{2}\right ) - 2 \, x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 0.07, size = 23, normalized size = 1.00 \begin {gather*} x\,\ln \left (a^2+x^2\right )-2\,x+2\,a\,\mathrm {atan}\left (\frac {x}{a}\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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