Integrand size = 18, antiderivative size = 49 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {\arctan \left (\sqrt {\frac {2}{5+\sqrt {21}}} x\right )}{\sqrt {7}}+\frac {\arctan \left (\sqrt {\frac {1}{2} \left (5+\sqrt {21}\right )} x\right )}{\sqrt {7}} \]
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Time = 0.06 (sec) , antiderivative size = 49, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.111, Rules used = {1177, 209} \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {\arctan \left (\sqrt {\frac {2}{5+\sqrt {21}}} x\right )}{\sqrt {7}}+\frac {\arctan \left (\sqrt {\frac {1}{2} \left (5+\sqrt {21}\right )} x\right )}{\sqrt {7}} \]
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Rule 209
Rule 1177
Rubi steps \begin{align*} \text {integral}& = \frac {1}{14} \left (7-\sqrt {21}\right ) \int \frac {1}{\frac {5}{2}-\frac {\sqrt {21}}{2}+x^2} \, dx+\frac {1}{14} \left (7+\sqrt {21}\right ) \int \frac {1}{\frac {5}{2}+\frac {\sqrt {21}}{2}+x^2} \, dx \\ & = \frac {\tan ^{-1}\left (\sqrt {\frac {2}{5+\sqrt {21}}} x\right )}{\sqrt {7}}+\frac {\tan ^{-1}\left (\sqrt {\frac {1}{2} \left (5+\sqrt {21}\right )} x\right )}{\sqrt {7}} \\ \end{align*}
Time = 0.10 (sec) , antiderivative size = 83, normalized size of antiderivative = 1.69 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {\left (-3+\sqrt {21}\right ) \arctan \left (\sqrt {\frac {2}{5-\sqrt {21}}} x\right )}{\sqrt {42 \left (5-\sqrt {21}\right )}}+\frac {\left (3+\sqrt {21}\right ) \arctan \left (\sqrt {\frac {2}{5+\sqrt {21}}} x\right )}{\sqrt {42 \left (5+\sqrt {21}\right )}} \]
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Time = 0.10 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.71
method | result | size |
risch | \(\frac {\sqrt {7}\, \arctan \left (\frac {x \sqrt {7}}{7}\right )}{7}+\frac {\sqrt {7}\, \arctan \left (\frac {x^{3} \sqrt {7}}{7}+\frac {6 x \sqrt {7}}{7}\right )}{7}\) | \(35\) |
default | \(\frac {2 \left (3+\sqrt {21}\right ) \sqrt {21}\, \arctan \left (\frac {4 x}{2 \sqrt {7}+2 \sqrt {3}}\right )}{21 \left (2 \sqrt {7}+2 \sqrt {3}\right )}+\frac {2 \left (-3+\sqrt {21}\right ) \sqrt {21}\, \arctan \left (\frac {4 x}{2 \sqrt {7}-2 \sqrt {3}}\right )}{21 \left (2 \sqrt {7}-2 \sqrt {3}\right )}\) | \(82\) |
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Time = 0.25 (sec) , antiderivative size = 31, normalized size of antiderivative = 0.63 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {1}{7} \, \sqrt {7} \arctan \left (\frac {1}{7} \, \sqrt {7} {\left (x^{3} + 6 \, x\right )}\right ) + \frac {1}{7} \, \sqrt {7} \arctan \left (\frac {1}{7} \, \sqrt {7} x\right ) \]
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Time = 0.05 (sec) , antiderivative size = 41, normalized size of antiderivative = 0.84 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {\sqrt {7} \cdot \left (2 \operatorname {atan}{\left (\frac {\sqrt {7} x}{7} \right )} + 2 \operatorname {atan}{\left (\frac {\sqrt {7} x^{3}}{7} + \frac {6 \sqrt {7} x}{7} \right )}\right )}{14} \]
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\[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\int { \frac {x^{2} + 1}{x^{4} + 5 \, x^{2} + 1} \,d x } \]
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Time = 0.27 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.53 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {1}{14} \, \sqrt {7} {\left (\pi \mathrm {sgn}\left (x\right ) + 2 \, \arctan \left (\frac {\sqrt {7} {\left (x^{2} - 1\right )}}{7 \, x}\right )\right )} \]
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Time = 13.28 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.59 \[ \int \frac {1+x^2}{1+5 x^2+x^4} \, dx=\frac {\sqrt {7}\,\left (\mathrm {atan}\left (\frac {\sqrt {7}\,x^3}{7}+\frac {6\,\sqrt {7}\,x}{7}\right )+\mathrm {atan}\left (\frac {\sqrt {7}\,x}{7}\right )\right )}{7} \]
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