Integrand size = 26, antiderivative size = 23 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=-\frac {1}{4 \left (1+x^2\right )^2}+\frac {2}{1+x^2}+\arctan (x) \]
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Time = 0.02 (sec) , antiderivative size = 23, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.115, Rules used = {1828, 12, 209} \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\arctan (x)+\frac {2}{x^2+1}-\frac {1}{4 \left (x^2+1\right )^2} \]
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Rule 12
Rule 209
Rule 1828
Rubi steps \begin{align*} \text {integral}& = -\frac {1}{4 \left (1+x^2\right )^2}-\frac {1}{4} \int \frac {-4+16 x-4 x^2}{\left (1+x^2\right )^2} \, dx \\ & = -\frac {1}{4 \left (1+x^2\right )^2}+\frac {2}{1+x^2}+\frac {1}{8} \int \frac {8}{1+x^2} \, dx \\ & = -\frac {1}{4 \left (1+x^2\right )^2}+\frac {2}{1+x^2}+\int \frac {1}{1+x^2} \, dx \\ & = -\frac {1}{4 \left (1+x^2\right )^2}+\frac {2}{1+x^2}+\tan ^{-1}(x) \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 23, normalized size of antiderivative = 1.00 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=-\frac {1}{4 \left (1+x^2\right )^2}+\frac {2}{1+x^2}+\arctan (x) \]
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Time = 0.80 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.83
method | result | size |
default | \(\frac {2 x^{2}+\frac {7}{4}}{\left (x^{2}+1\right )^{2}}+\arctan \left (x \right )\) | \(19\) |
risch | \(\frac {2 x^{2}+\frac {7}{4}}{\left (x^{2}+1\right )^{2}}+\arctan \left (x \right )\) | \(19\) |
parallelrisch | \(-\frac {2 i \ln \left (x -i\right ) x^{4}-2 i \ln \left (x +i\right ) x^{4}-3+4 i \ln \left (x -i\right ) x^{2}-4 i \ln \left (x +i\right ) x^{2}+4 x^{4}+2 i \ln \left (x -i\right )-2 i \ln \left (x +i\right )}{4 \left (x^{2}+1\right )^{2}}\) | \(77\) |
meijerg | \(\frac {x \left (3 x^{2}+5\right )}{8 \left (x^{2}+1\right )^{2}}+\arctan \left (x \right )-\frac {x \left (25 x^{2}+15\right )}{40 \left (x^{2}+1\right )^{2}}-\frac {x^{4}}{\left (x^{2}+1\right )^{2}}-\frac {x \left (-3 x^{2}+3\right )}{12 \left (x^{2}+1\right )^{2}}-\frac {3 x^{2} \left (x^{2}+2\right )}{4 \left (x^{2}+1\right )^{2}}\) | \(84\) |
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Time = 0.25 (sec) , antiderivative size = 35, normalized size of antiderivative = 1.52 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\frac {8 \, x^{2} + 4 \, {\left (x^{4} + 2 \, x^{2} + 1\right )} \arctan \left (x\right ) + 7}{4 \, {\left (x^{4} + 2 \, x^{2} + 1\right )}} \]
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Time = 0.06 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.87 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\frac {8 x^{2} + 7}{4 x^{4} + 8 x^{2} + 4} + \operatorname {atan}{\left (x \right )} \]
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Time = 0.31 (sec) , antiderivative size = 24, normalized size of antiderivative = 1.04 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\frac {8 \, x^{2} + 7}{4 \, {\left (x^{4} + 2 \, x^{2} + 1\right )}} + \arctan \left (x\right ) \]
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Time = 0.35 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.83 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\frac {8 \, x^{2} + 7}{4 \, {\left (x^{2} + 1\right )}^{2}} + \arctan \left (x\right ) \]
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Time = 9.25 (sec) , antiderivative size = 23, normalized size of antiderivative = 1.00 \[ \int \frac {1-3 x+2 x^2-4 x^3+x^4}{\left (1+x^2\right )^3} \, dx=\mathrm {atan}\left (x\right )+\frac {2\,x^2+\frac {7}{4}}{x^4+2\,x^2+1} \]
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