Integrand size = 12, antiderivative size = 44 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=\frac {2 a^2 x}{3}-\frac {2 x^3}{9}-\frac {2}{3} a^3 \arctan \left (\frac {x}{a}\right )+\frac {1}{3} x^3 \log \left (a^2+x^2\right ) \]
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Time = 0.02 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {2505, 308, 209} \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=-\frac {2}{3} a^3 \arctan \left (\frac {x}{a}\right )+\frac {1}{3} x^3 \log \left (a^2+x^2\right )+\frac {2 a^2 x}{3}-\frac {2 x^3}{9} \]
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Rule 209
Rule 308
Rule 2505
Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} x^3 \log \left (a^2+x^2\right )-\frac {2}{3} \int \frac {x^4}{a^2+x^2} \, dx \\ & = \frac {1}{3} x^3 \log \left (a^2+x^2\right )-\frac {2}{3} \int \left (-a^2+x^2+\frac {a^4}{a^2+x^2}\right ) \, dx \\ & = \frac {2 a^2 x}{3}-\frac {2 x^3}{9}+\frac {1}{3} x^3 \log \left (a^2+x^2\right )-\frac {1}{3} \left (2 a^4\right ) \int \frac {1}{a^2+x^2} \, dx \\ & = \frac {2 a^2 x}{3}-\frac {2 x^3}{9}-\frac {2}{3} a^3 \arctan \left (\frac {x}{a}\right )+\frac {1}{3} x^3 \log \left (a^2+x^2\right ) \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.00 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=\frac {2 a^2 x}{3}-\frac {2 x^3}{9}-\frac {2}{3} a^3 \arctan \left (\frac {x}{a}\right )+\frac {1}{3} x^3 \log \left (a^2+x^2\right ) \]
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Time = 0.10 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.84
method | result | size |
default | \(\frac {2 a^{2} x}{3}-\frac {2 x^{3}}{9}-\frac {2 a^{3} \arctan \left (\frac {x}{a}\right )}{3}+\frac {x^{3} \ln \left (a^{2}+x^{2}\right )}{3}\) | \(37\) |
risch | \(\frac {2 a^{2} x}{3}-\frac {2 x^{3}}{9}-\frac {2 a^{3} \arctan \left (\frac {x}{a}\right )}{3}+\frac {x^{3} \ln \left (a^{2}+x^{2}\right )}{3}\) | \(37\) |
parts | \(\frac {2 a^{2} x}{3}-\frac {2 x^{3}}{9}-\frac {2 a^{3} \arctan \left (\frac {x}{a}\right )}{3}+\frac {x^{3} \ln \left (a^{2}+x^{2}\right )}{3}\) | \(37\) |
parallelrisch | \(\frac {2 i \ln \left (-i a +x \right ) a^{3}}{3}-\frac {i \ln \left (a^{2}+x^{2}\right ) a^{3}}{3}+\frac {x^{3} \ln \left (a^{2}+x^{2}\right )}{3}-\frac {2 x^{3}}{9}+\frac {2 a^{2} x}{3}\) | \(53\) |
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Time = 0.25 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.82 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=-\frac {2}{3} \, a^{3} \arctan \left (\frac {x}{a}\right ) + \frac {1}{3} \, x^{3} \log \left (a^{2} + x^{2}\right ) + \frac {2}{3} \, a^{2} x - \frac {2}{9} \, x^{3} \]
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Result contains complex when optimal does not.
Time = 0.10 (sec) , antiderivative size = 53, normalized size of antiderivative = 1.20 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=- 2 a^{3} \left (- \frac {i \log {\left (- i a + x \right )}}{6} + \frac {i \log {\left (i a + x \right )}}{6}\right ) + \frac {2 a^{2} x}{3} + \frac {x^{3} \log {\left (a^{2} + x^{2} \right )}}{3} - \frac {2 x^{3}}{9} \]
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Time = 0.26 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.82 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=-\frac {2}{3} \, a^{3} \arctan \left (\frac {x}{a}\right ) + \frac {1}{3} \, x^{3} \log \left (a^{2} + x^{2}\right ) + \frac {2}{3} \, a^{2} x - \frac {2}{9} \, x^{3} \]
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Time = 0.31 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.82 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=-\frac {2}{3} \, a^{3} \arctan \left (\frac {x}{a}\right ) + \frac {1}{3} \, x^{3} \log \left (a^{2} + x^{2}\right ) + \frac {2}{3} \, a^{2} x - \frac {2}{9} \, x^{3} \]
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Time = 0.04 (sec) , antiderivative size = 65, normalized size of antiderivative = 1.48 \[ \int x^2 \log \left (a^2+x^2\right ) \, dx=\frac {2\,a^2\,x}{3}-\frac {\ln \left (x-\sqrt {-a^2}\right )\,{\left (-a^2\right )}^{3/2}}{3}+\frac {x^3\,\ln \left (a^2+x^2\right )}{3}+\frac {\ln \left (x+\sqrt {-a^2}\right )\,{\left (-a^2\right )}^{3/2}}{3}-\frac {2\,x^3}{9} \]
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