Optimal. Leaf size=31 \[ \log \left (x^2+x+1\right )+\log (x+1)-\frac {2 \tan ^{-1}\left (\frac {2 x+1}{\sqrt {3}}\right )}{\sqrt {3}} \]
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Rubi [A] time = 0.04, antiderivative size = 31, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 5, integrand size = 26, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.192, Rules used = {2074, 634, 618, 204, 628} \[ \log \left (x^2+x+1\right )+\log (x+1)-\frac {2 \tan ^{-1}\left (\frac {2 x+1}{\sqrt {3}}\right )}{\sqrt {3}} \]
Antiderivative was successfully verified.
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Rule 204
Rule 618
Rule 628
Rule 634
Rule 2074
Rubi steps
\begin {align*} \int \frac {1+3 x+3 x^2}{1+2 x+2 x^2+x^3} \, dx &=\int \left (\frac {1}{1+x}+\frac {2 x}{1+x+x^2}\right ) \, dx\\ &=\log (1+x)+2 \int \frac {x}{1+x+x^2} \, dx\\ &=\log (1+x)-\int \frac {1}{1+x+x^2} \, dx+\int \frac {1+2 x}{1+x+x^2} \, dx\\ &=\log (1+x)+\log \left (1+x+x^2\right )+2 \operatorname {Subst}\left (\int \frac {1}{-3-x^2} \, dx,x,1+2 x\right )\\ &=-\frac {2 \tan ^{-1}\left (\frac {1+2 x}{\sqrt {3}}\right )}{\sqrt {3}}+\log (1+x)+\log \left (1+x+x^2\right )\\ \end {align*}
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Mathematica [A] time = 0.01, size = 31, normalized size = 1.00 \[ \log \left (x^2+x+1\right )+\log (x+1)-\frac {2 \tan ^{-1}\left (\frac {2 x+1}{\sqrt {3}}\right )}{\sqrt {3}} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.89, size = 28, normalized size = 0.90 \[ -\frac {2}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (2 \, x + 1\right )}\right ) + \log \left (x^{2} + x + 1\right ) + \log \left (x + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.28, size = 29, normalized size = 0.94 \[ -\frac {2}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (2 \, x + 1\right )}\right ) + \log \left (x^{2} + x + 1\right ) + \log \left ({\left | x + 1 \right |}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.00, size = 29, normalized size = 0.94 \[ -\frac {2 \sqrt {3}\, \arctan \left (\frac {\left (2 x +1\right ) \sqrt {3}}{3}\right )}{3}+\ln \left (x +1\right )+\ln \left (x^{2}+x +1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 2.36, size = 28, normalized size = 0.90 \[ -\frac {2}{3} \, \sqrt {3} \arctan \left (\frac {1}{3} \, \sqrt {3} {\left (2 \, x + 1\right )}\right ) + \log \left (x^{2} + x + 1\right ) + \log \left (x + 1\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.11, size = 57, normalized size = 1.84 \[ \ln \left (x+\frac {1}{2}-\frac {\sqrt {3}\,1{}\mathrm {i}}{2}\right )+\ln \left (x+\frac {1}{2}+\frac {\sqrt {3}\,1{}\mathrm {i}}{2}\right )+\ln \left (x+1\right )+\frac {\sqrt {3}\,\ln \left (x+\frac {1}{2}-\frac {\sqrt {3}\,1{}\mathrm {i}}{2}\right )\,1{}\mathrm {i}}{3}-\frac {\sqrt {3}\,\ln \left (x+\frac {1}{2}+\frac {\sqrt {3}\,1{}\mathrm {i}}{2}\right )\,1{}\mathrm {i}}{3} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 0.13, size = 3, normalized size = 0.10 \[ \log {\left (x + 1 \right )} \]
Verification of antiderivative is not currently implemented for this CAS.
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