Integrand size = 20, antiderivative size = 44 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {\arctan \left (\frac {x}{\sqrt {2-\sqrt {3}}}\right )}{\sqrt {2}}-\frac {\arctan \left (\frac {x}{\sqrt {2+\sqrt {3}}}\right )}{\sqrt {2}} \]
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Time = 0.02 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.100, Rules used = {1177, 209} \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {\arctan \left (\frac {x}{\sqrt {2-\sqrt {3}}}\right )}{\sqrt {2}}-\frac {\arctan \left (\frac {x}{\sqrt {2+\sqrt {3}}}\right )}{\sqrt {2}} \]
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Rule 209
Rule 1177
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \left (-1-\sqrt {3}\right ) \int \frac {1}{2+\sqrt {3}+x^2} \, dx+\frac {1}{2} \left (-1+\sqrt {3}\right ) \int \frac {1}{2-\sqrt {3}+x^2} \, dx \\ & = \frac {\tan ^{-1}\left (\frac {x}{\sqrt {2-\sqrt {3}}}\right )}{\sqrt {2}}-\frac {\tan ^{-1}\left (\frac {x}{\sqrt {2+\sqrt {3}}}\right )}{\sqrt {2}} \\ \end{align*}
Time = 0.04 (sec) , antiderivative size = 82, normalized size of antiderivative = 1.86 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {-\left (\left (-3+\sqrt {3}\right ) \sqrt {2+\sqrt {3}} \arctan \left (\frac {x}{\sqrt {2-\sqrt {3}}}\right )\right )-\sqrt {2-\sqrt {3}} \left (3+\sqrt {3}\right ) \arctan \left (\frac {x}{\sqrt {2+\sqrt {3}}}\right )}{2 \sqrt {3}} \]
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Time = 0.05 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.80
method | result | size |
risch | \(-\frac {\sqrt {2}\, \arctan \left (\frac {x \sqrt {2}}{2}\right )}{2}+\frac {\sqrt {2}\, \arctan \left (\frac {x^{3} \sqrt {2}}{2}+\frac {3 x \sqrt {2}}{2}\right )}{2}\) | \(35\) |
default | \(-\frac {\sqrt {3}\, \left (\sqrt {3}+3\right ) \arctan \left (\frac {2 x}{\sqrt {6}+\sqrt {2}}\right )}{3 \left (\sqrt {6}+\sqrt {2}\right )}-\frac {\left (-3+\sqrt {3}\right ) \sqrt {3}\, \arctan \left (\frac {2 x}{\sqrt {6}-\sqrt {2}}\right )}{3 \left (\sqrt {6}-\sqrt {2}\right )}\) | \(70\) |
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Time = 0.25 (sec) , antiderivative size = 31, normalized size of antiderivative = 0.70 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {1}{2} \, \sqrt {2} \arctan \left (\frac {1}{2} \, \sqrt {2} {\left (x^{3} + 3 \, x\right )}\right ) - \frac {1}{2} \, \sqrt {2} \arctan \left (\frac {1}{2} \, \sqrt {2} x\right ) \]
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Time = 0.07 (sec) , antiderivative size = 42, normalized size of antiderivative = 0.95 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=- \frac {\sqrt {2} \cdot \left (2 \operatorname {atan}{\left (\frac {\sqrt {2} x}{2} \right )} - 2 \operatorname {atan}{\left (\frac {\sqrt {2} x^{3}}{2} + \frac {3 \sqrt {2} x}{2} \right )}\right )}{4} \]
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\[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\int { -\frac {x^{2} - 1}{x^{4} + 4 \, x^{2} + 1} \,d x } \]
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Time = 0.27 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.59 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {1}{4} \, \sqrt {2} {\left (\pi \mathrm {sgn}\left (x\right ) - 2 \, \arctan \left (\frac {\sqrt {2} {\left (x^{2} + 1\right )}}{2 \, x}\right )\right )} \]
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Time = 0.09 (sec) , antiderivative size = 31, normalized size of antiderivative = 0.70 \[ \int \frac {1-x^2}{1+4 x^2+x^4} \, dx=\frac {\sqrt {2}\,\left (\mathrm {atan}\left (\frac {\sqrt {2}\,x^3}{2}+\frac {3\,\sqrt {2}\,x}{2}\right )-\mathrm {atan}\left (\frac {\sqrt {2}\,x}{2}\right )\right )}{2} \]
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