Integrand size = 15, antiderivative size = 24 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {b x^2}{2}+a \arctan (x)-\frac {1}{2} b \log \left (1+x^2\right ) \]
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Time = 0.01 (sec) , antiderivative size = 24, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.267, Rules used = {1824, 649, 209, 266} \[ \int \frac {a+b x^3}{1+x^2} \, dx=a \arctan (x)+\frac {b x^2}{2}-\frac {1}{2} b \log \left (x^2+1\right ) \]
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Rule 209
Rule 266
Rule 649
Rule 1824
Rubi steps \begin{align*} \text {integral}& = \int \left (b x+\frac {a-b x}{1+x^2}\right ) \, dx \\ & = \frac {b x^2}{2}+\int \frac {a-b x}{1+x^2} \, dx \\ & = \frac {b x^2}{2}+a \int \frac {1}{1+x^2} \, dx-b \int \frac {x}{1+x^2} \, dx \\ & = \frac {b x^2}{2}+a \tan ^{-1}(x)-\frac {1}{2} b \log \left (1+x^2\right ) \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 22, normalized size of antiderivative = 0.92 \[ \int \frac {a+b x^3}{1+x^2} \, dx=a \arctan (x)+\frac {1}{2} b \left (x^2-\log \left (1+x^2\right )\right ) \]
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Time = 0.82 (sec) , antiderivative size = 21, normalized size of antiderivative = 0.88
method | result | size |
default | \(\frac {b \,x^{2}}{2}+a \arctan \left (x \right )-\frac {b \ln \left (x^{2}+1\right )}{2}\) | \(21\) |
meijerg | \(\frac {b \left (x^{2}-\ln \left (x^{2}+1\right )\right )}{2}+a \arctan \left (x \right )\) | \(21\) |
risch | \(\frac {b \,x^{2}}{2}+a \arctan \left (x \right )-\frac {b \ln \left (x^{2}+1\right )}{2}\) | \(21\) |
parallelrisch | \(\frac {b \,x^{2}}{2}-\frac {\ln \left (x -i\right ) b}{2}-\frac {i \ln \left (x -i\right ) a}{2}-\frac {\ln \left (x +i\right ) b}{2}+\frac {i \ln \left (x +i\right ) a}{2}\) | \(42\) |
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none
Time = 0.28 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.83 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {1}{2} \, b x^{2} + a \arctan \left (x\right ) - \frac {1}{2} \, b \log \left (x^{2} + 1\right ) \]
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Result contains complex when optimal does not.
Time = 0.08 (sec) , antiderivative size = 34, normalized size of antiderivative = 1.42 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {b x^{2}}{2} + \left (- \frac {i a}{2} - \frac {b}{2}\right ) \log {\left (x - i \right )} + \left (\frac {i a}{2} - \frac {b}{2}\right ) \log {\left (x + i \right )} \]
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none
Time = 0.29 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.83 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {1}{2} \, b x^{2} + a \arctan \left (x\right ) - \frac {1}{2} \, b \log \left (x^{2} + 1\right ) \]
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none
Time = 0.29 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.83 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {1}{2} \, b x^{2} + a \arctan \left (x\right ) - \frac {1}{2} \, b \log \left (x^{2} + 1\right ) \]
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Time = 9.34 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.83 \[ \int \frac {a+b x^3}{1+x^2} \, dx=\frac {b\,x^2}{2}-\frac {b\,\ln \left (x^2+1\right )}{2}+a\,\mathrm {atan}\left (x\right ) \]
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