Integrand size = 13, antiderivative size = 14 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {x}{1+x^2}+2 \arctan (x) \]
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Time = 0.00 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.154, Rules used = {393, 209} \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=2 \arctan (x)+\frac {x}{x^2+1} \]
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Rule 209
Rule 393
Rubi steps \begin{align*} \text {integral}& = \frac {x}{1+x^2}+2 \int \frac {1}{1+x^2} \, dx \\ & = \frac {x}{1+x^2}+2 \tan ^{-1}(x) \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.00 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {x}{1+x^2}+2 \arctan (x) \]
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Time = 2.55 (sec) , antiderivative size = 15, normalized size of antiderivative = 1.07
method | result | size |
default | \(\frac {x}{x^{2}+1}+2 \arctan \left (x \right )\) | \(15\) |
risch | \(\frac {x}{x^{2}+1}+2 \arctan \left (x \right )\) | \(15\) |
meijerg | \(-\frac {x}{2 \left (x^{2}+1\right )}+2 \arctan \left (x \right )+\frac {3 x}{2 x^{2}+2}\) | \(28\) |
parallelrisch | \(-\frac {i \ln \left (x -i\right ) x^{2}-i \ln \left (x +i\right ) x^{2}+i \ln \left (x -i\right )-i \ln \left (x +i\right )-x}{x^{2}+1}\) | \(52\) |
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none
Time = 0.24 (sec) , antiderivative size = 19, normalized size of antiderivative = 1.36 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {2 \, {\left (x^{2} + 1\right )} \arctan \left (x\right ) + x}{x^{2} + 1} \]
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Time = 0.04 (sec) , antiderivative size = 10, normalized size of antiderivative = 0.71 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {x}{x^{2} + 1} + 2 \operatorname {atan}{\left (x \right )} \]
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none
Time = 0.26 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.00 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {x}{x^{2} + 1} + 2 \, \arctan \left (x\right ) \]
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Time = 0.30 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.00 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=\frac {x}{x^{2} + 1} + 2 \, \arctan \left (x\right ) \]
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Time = 0.03 (sec) , antiderivative size = 14, normalized size of antiderivative = 1.00 \[ \int \frac {3+x^2}{\left (1+x^2\right )^2} \, dx=2\,\mathrm {atan}\left (x\right )+\frac {x}{x^2+1} \]
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