Optimal. Leaf size=46 \[ \frac{\log \left (x^2+\sqrt{3} x+1\right )}{2 \sqrt{3}}-\frac{\log \left (x^2-\sqrt{3} x+1\right )}{2 \sqrt{3}} \]
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Rubi [A] time = 0.0210366, antiderivative size = 46, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 2, integrand size = 20, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.1, Rules used = {1164, 628} \[ \frac{\log \left (x^2+\sqrt{3} x+1\right )}{2 \sqrt{3}}-\frac{\log \left (x^2-\sqrt{3} x+1\right )}{2 \sqrt{3}} \]
Antiderivative was successfully verified.
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Rule 1164
Rule 628
Rubi steps
\begin{align*} \int \frac{1-x^2}{1-x^2+x^4} \, dx &=-\frac{\int \frac{\sqrt{3}+2 x}{-1-\sqrt{3} x-x^2} \, dx}{2 \sqrt{3}}-\frac{\int \frac{\sqrt{3}-2 x}{-1+\sqrt{3} x-x^2} \, dx}{2 \sqrt{3}}\\ &=-\frac{\log \left (1-\sqrt{3} x+x^2\right )}{2 \sqrt{3}}+\frac{\log \left (1+\sqrt{3} x+x^2\right )}{2 \sqrt{3}}\\ \end{align*}
Mathematica [A] time = 0.0125238, size = 40, normalized size = 0.87 \[ \frac{\log \left (x^2+\sqrt{3} x+1\right )-\log \left (-x^2+\sqrt{3} x-1\right )}{2 \sqrt{3}} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.049, size = 35, normalized size = 0.8 \begin{align*} -{\frac{\ln \left ( 1+{x}^{2}-x\sqrt{3} \right ) \sqrt{3}}{6}}+{\frac{\ln \left ( 1+{x}^{2}+x\sqrt{3} \right ) \sqrt{3}}{6}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F] time = 0., size = 0, normalized size = 0. \begin{align*} -\int \frac{x^{2} - 1}{x^{4} - x^{2} + 1}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.32572, size = 100, normalized size = 2.17 \begin{align*} \frac{1}{6} \, \sqrt{3} \log \left (\frac{x^{4} + 5 \, x^{2} + 2 \, \sqrt{3}{\left (x^{3} + x\right )} + 1}{x^{4} - x^{2} + 1}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.100779, size = 39, normalized size = 0.85 \begin{align*} - \frac{\sqrt{3} \log{\left (x^{2} - \sqrt{3} x + 1 \right )}}{6} + \frac{\sqrt{3} \log{\left (x^{2} + \sqrt{3} x + 1 \right )}}{6} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.12561, size = 53, normalized size = 1.15 \begin{align*} -\frac{1}{6} \, \sqrt{3} \log \left (\frac{{\left | 2 \, x - 2 \, \sqrt{3} + \frac{2}{x} \right |}}{{\left | 2 \, x + 2 \, \sqrt{3} + \frac{2}{x} \right |}}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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