Integrand size = 25, antiderivative size = 20 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 \log \left (x+x \left (1+\frac {5-x}{5+x}\right )\right ) \]
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Time = 0.03 (sec) , antiderivative size = 17, normalized size of antiderivative = 0.85, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.080, Rules used = {1608, 1642} \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 \log (x)+2 \log (x+5)-2 \log (x+15) \]
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Rule 1608
Rule 1642
Rubi steps \begin{align*} \text {integral}& = \int \frac {-150-20 x-2 x^2}{x \left (75+20 x+x^2\right )} \, dx \\ & = \int \left (-\frac {2}{x}+\frac {2}{5+x}-\frac {2}{15+x}\right ) \, dx \\ & = -2 \log (x)+2 \log (5+x)-2 \log (15+x) \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 (\log (x)-\log (5+x)+\log (15+x)) \]
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Time = 0.03 (sec) , antiderivative size = 18, normalized size of antiderivative = 0.90
method | result | size |
default | \(-2 \ln \left (x \right )+2 \ln \left (5+x \right )-2 \ln \left (x +15\right )\) | \(18\) |
norman | \(-2 \ln \left (x \right )+2 \ln \left (5+x \right )-2 \ln \left (x +15\right )\) | \(18\) |
risch | \(2 \ln \left (5+x \right )-2 \ln \left (x^{2}+15 x \right )\) | \(18\) |
parallelrisch | \(-2 \ln \left (x \right )+2 \ln \left (5+x \right )-2 \ln \left (x +15\right )\) | \(18\) |
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none
Time = 0.24 (sec) , antiderivative size = 17, normalized size of antiderivative = 0.85 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 \, \log \left (x^{2} + 15 \, x\right ) + 2 \, \log \left (x + 5\right ) \]
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Time = 0.05 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=2 \log {\left (x + 5 \right )} - 2 \log {\left (x^{2} + 15 x \right )} \]
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none
Time = 0.19 (sec) , antiderivative size = 17, normalized size of antiderivative = 0.85 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 \, \log \left (x + 15\right ) + 2 \, \log \left (x + 5\right ) - 2 \, \log \left (x\right ) \]
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none
Time = 0.27 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=-2 \, \log \left ({\left | x + 15 \right |}\right ) + 2 \, \log \left ({\left | x + 5 \right |}\right ) - 2 \, \log \left ({\left | x \right |}\right ) \]
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Time = 0.10 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75 \[ \int \frac {-150-20 x-2 x^2}{75 x+20 x^2+x^3} \, dx=2\,\ln \left (x+5\right )-2\,\ln \left (x\,\left (x+15\right )\right ) \]
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