Integrand size = 22, antiderivative size = 39 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=-\frac {1}{2} \log (1-2 x)+\frac {1}{2} \log (1-x)-\frac {1}{2} \log (1+x)+\frac {1}{2} \log (1+2 x) \]
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Time = 0.01 (sec) , antiderivative size = 39, normalized size of antiderivative = 1.00, number of steps used = 7, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.136, Rules used = {1175, 630, 31} \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=-\frac {1}{2} \log (1-2 x)+\frac {1}{2} \log (1-x)-\frac {1}{2} \log (x+1)+\frac {1}{2} \log (2 x+1) \]
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Rule 31
Rule 630
Rule 1175
Rubi steps \begin{align*} \text {integral}& = \frac {1}{4} \int \frac {1}{\frac {1}{2}-\frac {3 x}{2}+x^2} \, dx+\frac {1}{4} \int \frac {1}{\frac {1}{2}+\frac {3 x}{2}+x^2} \, dx \\ & = \frac {1}{2} \int \frac {1}{-1+x} \, dx-\frac {1}{2} \int \frac {1}{-\frac {1}{2}+x} \, dx+\frac {1}{2} \int \frac {1}{\frac {1}{2}+x} \, dx-\frac {1}{2} \int \frac {1}{1+x} \, dx \\ & = -\frac {1}{2} \log (1-2 x)+\frac {1}{2} \log (1-x)-\frac {1}{2} \log (1+x)+\frac {1}{2} \log (1+2 x) \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.74 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=-\frac {1}{2} \log \left (1-x-2 x^2\right )+\frac {1}{2} \log \left (1+x-2 x^2\right ) \]
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Time = 0.04 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.67
method | result | size |
risch | \(\frac {\ln \left (2 x^{2}-x -1\right )}{2}-\frac {\ln \left (2 x^{2}+x -1\right )}{2}\) | \(26\) |
parallelrisch | \(\frac {\ln \left (x -1\right )}{2}-\frac {\ln \left (x +1\right )}{2}-\frac {\ln \left (x -\frac {1}{2}\right )}{2}+\frac {\ln \left (x +\frac {1}{2}\right )}{2}\) | \(26\) |
default | \(\frac {\ln \left (1+2 x \right )}{2}-\frac {\ln \left (2 x -1\right )}{2}-\frac {\ln \left (x +1\right )}{2}+\frac {\ln \left (x -1\right )}{2}\) | \(30\) |
norman | \(\frac {\ln \left (1+2 x \right )}{2}-\frac {\ln \left (2 x -1\right )}{2}-\frac {\ln \left (x +1\right )}{2}+\frac {\ln \left (x -1\right )}{2}\) | \(30\) |
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Time = 0.26 (sec) , antiderivative size = 25, normalized size of antiderivative = 0.64 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=-\frac {1}{2} \, \log \left (2 \, x^{2} + x - 1\right ) + \frac {1}{2} \, \log \left (2 \, x^{2} - x - 1\right ) \]
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Time = 0.05 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.67 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=\frac {\log {\left (x^{2} - \frac {x}{2} - \frac {1}{2} \right )}}{2} - \frac {\log {\left (x^{2} + \frac {x}{2} - \frac {1}{2} \right )}}{2} \]
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Time = 0.20 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.74 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=\frac {1}{2} \, \log \left (2 \, x + 1\right ) - \frac {1}{2} \, \log \left (2 \, x - 1\right ) - \frac {1}{2} \, \log \left (x + 1\right ) + \frac {1}{2} \, \log \left (x - 1\right ) \]
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Time = 0.27 (sec) , antiderivative size = 33, normalized size of antiderivative = 0.85 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=\frac {1}{2} \, \log \left ({\left | 2 \, x + 1 \right |}\right ) - \frac {1}{2} \, \log \left ({\left | 2 \, x - 1 \right |}\right ) - \frac {1}{2} \, \log \left ({\left | x + 1 \right |}\right ) + \frac {1}{2} \, \log \left ({\left | x - 1 \right |}\right ) \]
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Time = 0.31 (sec) , antiderivative size = 14, normalized size of antiderivative = 0.36 \[ \int \frac {1+2 x^2}{1-5 x^2+4 x^4} \, dx=-\mathrm {atanh}\left (\frac {x}{2\,x^2-1}\right ) \]
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