Integrand size = 22, antiderivative size = 46 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\frac {\arctan \left (\frac {2 x}{\sqrt {3-\sqrt {5}}}\right )}{\sqrt {2}}-\frac {\arctan \left (\frac {2 x}{\sqrt {3+\sqrt {5}}}\right )}{\sqrt {2}} \]
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Time = 0.02 (sec) , antiderivative size = 46, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.091, Rules used = {1177, 209} \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\frac {\arctan \left (\frac {2 x}{\sqrt {3-\sqrt {5}}}\right )}{\sqrt {2}}-\frac {\arctan \left (\frac {2 x}{\sqrt {3+\sqrt {5}}}\right )}{\sqrt {2}} \]
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Rule 209
Rule 1177
Rubi steps \begin{align*} \text {integral}& = \left (-1-\sqrt {5}\right ) \int \frac {1}{3+\sqrt {5}+4 x^2} \, dx+\left (-1+\sqrt {5}\right ) \int \frac {1}{3-\sqrt {5}+4 x^2} \, dx \\ & = \frac {\tan ^{-1}\left (\frac {2 x}{\sqrt {3-\sqrt {5}}}\right )}{\sqrt {2}}-\frac {\tan ^{-1}\left (\frac {2 x}{\sqrt {3+\sqrt {5}}}\right )}{\sqrt {2}} \\ \end{align*}
Time = 0.05 (sec) , antiderivative size = 84, normalized size of antiderivative = 1.83 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\frac {-\left (\left (-5+\sqrt {5}\right ) \sqrt {3+\sqrt {5}} \arctan \left (\frac {2 x}{\sqrt {3-\sqrt {5}}}\right )\right )-\sqrt {3-\sqrt {5}} \left (5+\sqrt {5}\right ) \arctan \left (\frac {2 x}{\sqrt {3+\sqrt {5}}}\right )}{4 \sqrt {5}} \]
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Time = 0.05 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.74
method | result | size |
risch | \(-\frac {\arctan \left (x \sqrt {2}\right ) \sqrt {2}}{2}+\frac {\sqrt {2}\, \arctan \left (2 x^{3} \sqrt {2}+2 x \sqrt {2}\right )}{2}\) | \(34\) |
default | \(-\frac {2 \sqrt {5}\, \left (5+\sqrt {5}\right ) \arctan \left (\frac {8 x}{2 \sqrt {10}+2 \sqrt {2}}\right )}{5 \left (2 \sqrt {10}+2 \sqrt {2}\right )}-\frac {2 \left (-5+\sqrt {5}\right ) \sqrt {5}\, \arctan \left (\frac {8 x}{2 \sqrt {10}-2 \sqrt {2}}\right )}{5 \left (2 \sqrt {10}-2 \sqrt {2}\right )}\) | \(82\) |
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Time = 0.24 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.61 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\frac {1}{2} \, \sqrt {2} \arctan \left (2 \, \sqrt {2} {\left (x^{3} + x\right )}\right ) - \frac {1}{2} \, \sqrt {2} \arctan \left (\sqrt {2} x\right ) \]
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Time = 0.06 (sec) , antiderivative size = 39, normalized size of antiderivative = 0.85 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=- \frac {\sqrt {2} \cdot \left (2 \operatorname {atan}{\left (\sqrt {2} x \right )} - 2 \operatorname {atan}{\left (2 \sqrt {2} x^{3} + 2 \sqrt {2} x \right )}\right )}{4} \]
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\[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\int { -\frac {2 \, x^{2} - 1}{4 \, x^{4} + 6 \, x^{2} + 1} \,d x } \]
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Time = 0.28 (sec) , antiderivative size = 39, normalized size of antiderivative = 0.85 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=-\frac {1}{2} \, \sqrt {2} \arctan \left (\frac {4 \, x}{\sqrt {10} + \sqrt {2}}\right ) + \frac {1}{2} \, \sqrt {2} \arctan \left (\frac {4 \, x}{\sqrt {10} - \sqrt {2}}\right ) \]
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Time = 13.49 (sec) , antiderivative size = 30, normalized size of antiderivative = 0.65 \[ \int \frac {1-2 x^2}{1+6 x^2+4 x^4} \, dx=\frac {\sqrt {2}\,\left (\mathrm {atan}\left (2\,\sqrt {2}\,x^3+2\,\sqrt {2}\,x\right )-\mathrm {atan}\left (\sqrt {2}\,x\right )\right )}{2} \]
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