Optimal. Leaf size=16 \[ x \log \left (x^2+1\right )-2 x+2 \tan ^{-1}(x) \]
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Rubi [A] time = 0.0047707, antiderivative size = 16, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 6, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.5, Rules used = {2448, 321, 203} \[ x \log \left (x^2+1\right )-2 x+2 \tan ^{-1}(x) \]
Antiderivative was successfully verified.
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Rule 2448
Rule 321
Rule 203
Rubi steps
\begin{align*} \int \log \left (1+x^2\right ) \, dx &=x \log \left (1+x^2\right )-2 \int \frac{x^2}{1+x^2} \, dx\\ &=-2 x+x \log \left (1+x^2\right )+2 \int \frac{1}{1+x^2} \, dx\\ &=-2 x+2 \tan ^{-1}(x)+x \log \left (1+x^2\right )\\ \end{align*}
Mathematica [A] time = 0.0015108, size = 16, normalized size = 1. \[ x \log \left (x^2+1\right )-2 x+2 \tan ^{-1}(x) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.002, size = 17, normalized size = 1.1 \begin{align*} -2\,x+2\,\arctan \left ( x \right ) +x\ln \left ({x}^{2}+1 \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.43056, size = 22, normalized size = 1.38 \begin{align*} x \log \left (x^{2} + 1\right ) - 2 \, x + 2 \, \arctan \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.93475, size = 49, normalized size = 3.06 \begin{align*} x \log \left (x^{2} + 1\right ) - 2 \, x + 2 \, \arctan \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.117136, size = 15, normalized size = 0.94 \begin{align*} x \log{\left (x^{2} + 1 \right )} - 2 x + 2 \operatorname{atan}{\left (x \right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.05528, size = 22, normalized size = 1.38 \begin{align*} x \log \left (x^{2} + 1\right ) - 2 \, x + 2 \, \arctan \left (x\right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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