Optimal. Leaf size=23 \[ \frac{x^2}{4 \left (x^4+1\right )}+\frac{1}{4} \tan ^{-1}\left (x^2\right ) \]
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Rubi [A] time = 0.0070609, antiderivative size = 23, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 14, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.286, Rules used = {28, 275, 199, 203} \[ \frac{x^2}{4 \left (x^4+1\right )}+\frac{1}{4} \tan ^{-1}\left (x^2\right ) \]
Antiderivative was successfully verified.
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Rule 28
Rule 275
Rule 199
Rule 203
Rubi steps
\begin{align*} \int \frac{x}{1+2 x^4+x^8} \, dx &=\int \frac{x}{\left (1+x^4\right )^2} \, dx\\ &=\frac{1}{2} \operatorname{Subst}\left (\int \frac{1}{\left (1+x^2\right )^2} \, dx,x,x^2\right )\\ &=\frac{x^2}{4 \left (1+x^4\right )}+\frac{1}{4} \operatorname{Subst}\left (\int \frac{1}{1+x^2} \, dx,x,x^2\right )\\ &=\frac{x^2}{4 \left (1+x^4\right )}+\frac{1}{4} \tan ^{-1}\left (x^2\right )\\ \end{align*}
Mathematica [A] time = 0.0058095, size = 20, normalized size = 0.87 \[ \frac{1}{4} \left (\frac{x^2}{x^4+1}+\tan ^{-1}\left (x^2\right )\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 20, normalized size = 0.9 \begin{align*}{\frac{{x}^{2}}{4\,{x}^{4}+4}}+{\frac{\arctan \left ({x}^{2} \right ) }{4}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.45571, size = 26, normalized size = 1.13 \begin{align*} \frac{x^{2}}{4 \,{\left (x^{4} + 1\right )}} + \frac{1}{4} \, \arctan \left (x^{2}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.4642, size = 61, normalized size = 2.65 \begin{align*} \frac{x^{2} +{\left (x^{4} + 1\right )} \arctan \left (x^{2}\right )}{4 \,{\left (x^{4} + 1\right )}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.121276, size = 15, normalized size = 0.65 \begin{align*} \frac{x^{2}}{4 x^{4} + 4} + \frac{\operatorname{atan}{\left (x^{2} \right )}}{4} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.09231, size = 26, normalized size = 1.13 \begin{align*} \frac{x^{2}}{4 \,{\left (x^{4} + 1\right )}} + \frac{1}{4} \, \arctan \left (x^{2}\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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