Optimal. Leaf size=47 \[ \frac {\tanh ^{-1}\left (\frac {\sqrt {2} x+1}{\sqrt {3}}\right )}{\sqrt {6}}-\frac {\tanh ^{-1}\left (\frac {1-\sqrt {2} x}{\sqrt {3}}\right )}{\sqrt {6}} \]
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Rubi [A] time = 0.04, antiderivative size = 47, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 3, integrand size = 20, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.150, Rules used = {1161, 618, 206} \[ \frac {\tanh ^{-1}\left (\frac {\sqrt {2} x+1}{\sqrt {3}}\right )}{\sqrt {6}}-\frac {\tanh ^{-1}\left (\frac {1-\sqrt {2} x}{\sqrt {3}}\right )}{\sqrt {6}} \]
Antiderivative was successfully verified.
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Rule 206
Rule 618
Rule 1161
Rubi steps
\begin {align*} \int \frac {1-x^2}{1-4 x^2+x^4} \, dx &=-\left (\frac {1}{2} \int \frac {1}{-1-\sqrt {2} x+x^2} \, dx\right )-\frac {1}{2} \int \frac {1}{-1+\sqrt {2} x+x^2} \, dx\\ &=\operatorname {Subst}\left (\int \frac {1}{6-x^2} \, dx,x,-\sqrt {2}+2 x\right )+\operatorname {Subst}\left (\int \frac {1}{6-x^2} \, dx,x,\sqrt {2}+2 x\right )\\ &=\frac {\tanh ^{-1}\left (\frac {-1+\sqrt {2} x}{\sqrt {3}}\right )}{\sqrt {6}}+\frac {\tanh ^{-1}\left (\frac {1+\sqrt {2} x}{\sqrt {3}}\right )}{\sqrt {6}}\\ \end {align*}
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Mathematica [A] time = 0.02, size = 40, normalized size = 0.85 \[ \frac {\log \left (x^2+\sqrt {6} x+1\right )-\log \left (-x^2+\sqrt {6} x-1\right )}{2 \sqrt {6}} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.39, size = 39, normalized size = 0.83 \[ \frac {1}{12} \, \sqrt {6} \log \left (\frac {x^{4} + 8 \, x^{2} + 2 \, \sqrt {6} {\left (x^{3} + x\right )} + 1}{x^{4} - 4 \, x^{2} + 1}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.32, size = 39, normalized size = 0.83 \[ -\frac {1}{12} \, \sqrt {6} \log \left (\frac {{\left | 2 \, x - 2 \, \sqrt {6} + \frac {2}{x} \right |}}{{\left | 2 \, x + 2 \, \sqrt {6} + \frac {2}{x} \right |}}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.02, size = 70, normalized size = 1.49 \[ \frac {\left (\sqrt {3}-1\right ) \sqrt {3}\, \arctanh \left (\frac {2 x}{\sqrt {6}-\sqrt {2}}\right )}{3 \sqrt {6}-3 \sqrt {2}}+\frac {\left (1+\sqrt {3}\right ) \sqrt {3}\, \arctanh \left (\frac {2 x}{\sqrt {6}+\sqrt {2}}\right )}{3 \sqrt {6}+3 \sqrt {2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ -\int \frac {x^{2} - 1}{x^{4} - 4 \, x^{2} + 1}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 4.32, size = 18, normalized size = 0.38 \[ \frac {\sqrt {6}\,\mathrm {atanh}\left (\frac {\sqrt {6}\,x}{x^2+1}\right )}{6} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 0.12, size = 39, normalized size = 0.83 \[ - \frac {\sqrt {6} \log {\left (x^{2} - \sqrt {6} x + 1 \right )}}{12} + \frac {\sqrt {6} \log {\left (x^{2} + \sqrt {6} x + 1 \right )}}{12} \]
Verification of antiderivative is not currently implemented for this CAS.
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