Integrand size = 16, antiderivative size = 38 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=-\frac {\arctan \left (\frac {1-2 x}{\sqrt {3}}\right )}{\sqrt {3}}+\frac {\arctan \left (\frac {1+2 x}{\sqrt {3}}\right )}{\sqrt {3}} \]
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Time = 0.02 (sec) , antiderivative size = 38, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.188, Rules used = {1175, 632, 210} \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {\arctan \left (\frac {2 x+1}{\sqrt {3}}\right )}{\sqrt {3}}-\frac {\arctan \left (\frac {1-2 x}{\sqrt {3}}\right )}{\sqrt {3}} \]
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Rule 210
Rule 632
Rule 1175
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \int \frac {1}{1-x+x^2} \, dx+\frac {1}{2} \int \frac {1}{1+x+x^2} \, dx \\ & = -\text {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,-1+2 x\right )-\text {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,1+2 x\right ) \\ & = \frac {\tan ^{-1}\left (\frac {-1+2 x}{\sqrt {3}}\right )}{\sqrt {3}}+\frac {\tan ^{-1}\left (\frac {1+2 x}{\sqrt {3}}\right )}{\sqrt {3}} \\ \end{align*}
Result contains complex when optimal does not.
Time = 0.13 (sec) , antiderivative size = 99, normalized size of antiderivative = 2.61 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {\left (-i+\sqrt {3}\right ) \arctan \left (\frac {x}{\sqrt {\frac {1}{2} \left (1-i \sqrt {3}\right )}}\right )}{\sqrt {6 \left (1-i \sqrt {3}\right )}}+\frac {\left (i+\sqrt {3}\right ) \arctan \left (\frac {x}{\sqrt {\frac {1}{2} \left (1+i \sqrt {3}\right )}}\right )}{\sqrt {6 \left (1+i \sqrt {3}\right )}} \]
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Time = 0.05 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.89
method | result | size |
default | \(\frac {\sqrt {3}\, \arctan \left (\frac {\left (2 x -1\right ) \sqrt {3}}{3}\right )}{3}+\frac {\arctan \left (\frac {\left (1+2 x \right ) \sqrt {3}}{3}\right ) \sqrt {3}}{3}\) | \(34\) |
risch | \(\frac {\sqrt {3}\, \arctan \left (\frac {x \sqrt {3}}{3}\right )}{3}+\frac {\sqrt {3}\, \arctan \left (\frac {x^{3} \sqrt {3}}{3}+\frac {2 x \sqrt {3}}{3}\right )}{3}\) | \(35\) |
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Time = 0.24 (sec) , antiderivative size = 31, normalized size of antiderivative = 0.82 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {1}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (x^{3} + 2 \, x\right )}\right ) + \frac {1}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} x\right ) \]
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Time = 0.05 (sec) , antiderivative size = 41, normalized size of antiderivative = 1.08 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {\sqrt {3} \cdot \left (2 \operatorname {atan}{\left (\frac {\sqrt {3} x}{3} \right )} + 2 \operatorname {atan}{\left (\frac {\sqrt {3} x^{3}}{3} + \frac {2 \sqrt {3} x}{3} \right )}\right )}{6} \]
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Time = 0.28 (sec) , antiderivative size = 33, normalized size of antiderivative = 0.87 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {1}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (2 \, x + 1\right )}\right ) + \frac {1}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (2 \, x - 1\right )}\right ) \]
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none
Time = 0.27 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.68 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {1}{6} \, \sqrt {3} {\left (\pi \mathrm {sgn}\left (x\right ) + 2 \, \arctan \left (\frac {\sqrt {3} {\left (x^{2} - 1\right )}}{3 \, x}\right )\right )} \]
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Time = 0.09 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.76 \[ \int \frac {1+x^2}{1+x^2+x^4} \, dx=\frac {\sqrt {3}\,\left (\mathrm {atan}\left (\frac {\sqrt {3}\,x^3}{3}+\frac {2\,\sqrt {3}\,x}{3}\right )+\mathrm {atan}\left (\frac {\sqrt {3}\,x}{3}\right )\right )}{3} \]
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