Integrand size = 27, antiderivative size = 37 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=-\frac {2 \arctan \left (\frac {a-2 b x}{\sqrt {3} a}\right )}{\sqrt {3} b}+\frac {\log (a+b x)}{b} \]
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Time = 0.04 (sec) , antiderivative size = 37, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.148, Rules used = {1882, 31, 631, 210} \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {\log (a+b x)}{b}-\frac {2 \arctan \left (\frac {a-2 b x}{\sqrt {3} a}\right )}{\sqrt {3} b} \]
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Rule 31
Rule 210
Rule 631
Rule 1882
Rubi steps \begin{align*} \text {integral}& = \frac {a \int \frac {1}{\frac {a^2}{b^2}-\frac {a x}{b}+x^2} \, dx}{b^2}+\frac {\int \frac {1}{\frac {a}{b}+x} \, dx}{b} \\ & = \frac {\log (a+b x)}{b}+\frac {2 \text {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,1-\frac {2 b x}{a}\right )}{b} \\ & = -\frac {2 \tan ^{-1}\left (\frac {a-2 b x}{\sqrt {3} a}\right )}{\sqrt {3} b}+\frac {\log (a+b x)}{b} \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 72, normalized size of antiderivative = 1.95 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {2 \sqrt {3} \arctan \left (\frac {-a+2 b x}{\sqrt {3} a}\right )+2 \log (a+b x)-\log \left (a^2-a b x+b^2 x^2\right )+\log \left (a^3+b^3 x^3\right )}{3 b} \]
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Result contains higher order function than in optimal. Order 9 vs. order 3.
Time = 1.54 (sec) , antiderivative size = 42, normalized size of antiderivative = 1.14
method | result | size |
risch | \(\frac {\ln \left (b x +a \right )}{b}+\left (\munderset {\textit {\_R} =\operatorname {RootOf}\left (3 b^{2} \textit {\_Z}^{2}+1\right )}{\sum }\textit {\_R} \ln \left (3 a b \textit {\_R} +2 b x -a \right )\right )\) | \(42\) |
default | \(\frac {\ln \left (b x +a \right )}{b}+\frac {2 \sqrt {3}\, \arctan \left (\frac {\left (2 b^{2} x -a b \right ) \sqrt {3}}{3 a b}\right )}{3 b}\) | \(43\) |
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none
Time = 0.34 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.97 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {2 \, \sqrt {3} \arctan \left (\frac {\sqrt {3} {\left (2 \, b x - a\right )}}{3 \, a}\right ) + 3 \, \log \left (b x + a\right )}{3 \, b} \]
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Result contains complex when optimal does not.
Time = 0.14 (sec) , antiderivative size = 60, normalized size of antiderivative = 1.62 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {- \frac {\sqrt {3} i \log {\left (x + \frac {- a - \sqrt {3} i a}{2 b} \right )}}{3} + \frac {\sqrt {3} i \log {\left (x + \frac {- a + \sqrt {3} i a}{2 b} \right )}}{3} + \log {\left (\frac {a}{b} + x \right )}}{b} \]
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Time = 0.28 (sec) , antiderivative size = 42, normalized size of antiderivative = 1.14 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {2 \, \sqrt {3} \arctan \left (\frac {\sqrt {3} {\left (2 \, b^{2} x - a b\right )}}{3 \, a b}\right )}{3 \, b} + \frac {\log \left (b x + a\right )}{b} \]
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Time = 0.26 (sec) , antiderivative size = 37, normalized size of antiderivative = 1.00 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {2 \, \sqrt {3} \arctan \left (\frac {\sqrt {3} {\left (2 \, b x - a\right )}}{3 \, a}\right )}{3 \, b} + \frac {\log \left ({\left | b x + a \right |}\right )}{b} \]
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Time = 9.15 (sec) , antiderivative size = 84, normalized size of antiderivative = 2.27 \[ \int \frac {2 a^2+b^2 x^2}{a^3+b^3 x^3} \, dx=\frac {\ln \left (a+b\,x\right )}{b}-\frac {2\,\sqrt {3}\,\mathrm {atan}\left (\frac {4\,\sqrt {3}\,a^3\,b^4}{4\,a^3\,b^4+4\,x\,a^2\,b^5}-\frac {4\,\sqrt {3}\,a^2\,b^5\,x}{4\,a^3\,b^4+4\,x\,a^2\,b^5}\right )}{3\,b} \]
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