Integrand size = 15, antiderivative size = 14 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=3+\log \left (\log ^2\left (-8+\log \left (e^{2 x}\right )\right )\right ) \]
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Time = 0.02 (sec) , antiderivative size = 11, normalized size of antiderivative = 0.79, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.267, Rules used = {12, 2437, 2339, 29} \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \log (\log (-2 (4-x))) \]
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Rule 12
Rule 29
Rule 2339
Rule 2437
Rubi steps \begin{align*} \text {integral}& = 2 \int \frac {1}{(-4+x) \log (-8+2 x)} \, dx \\ & = \text {Subst}\left (\int \frac {2}{x \log (x)} \, dx,x,-8+2 x\right ) \\ & = 2 \text {Subst}\left (\int \frac {1}{x \log (x)} \, dx,x,-8+2 x\right ) \\ & = 2 \text {Subst}\left (\int \frac {1}{x} \, dx,x,\log (2 (-4+x))\right ) \\ & = 2 \log (\log (-2 (4-x))) \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.64 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \log (\log (2 (-4+x))) \]
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Time = 0.36 (sec) , antiderivative size = 10, normalized size of antiderivative = 0.71
method | result | size |
derivativedivides | \(2 \ln \left (\ln \left (2 x -8\right )\right )\) | \(10\) |
default | \(2 \ln \left (\ln \left (2 x -8\right )\right )\) | \(10\) |
norman | \(2 \ln \left (\ln \left (2 x -8\right )\right )\) | \(10\) |
risch | \(2 \ln \left (\ln \left (2 x -8\right )\right )\) | \(10\) |
parallelrisch | \(2 \ln \left (\ln \left (2 x -8\right )\right )\) | \(10\) |
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Time = 0.24 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.64 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \, \log \left (\log \left (2 \, x - 8\right )\right ) \]
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Time = 0.06 (sec) , antiderivative size = 8, normalized size of antiderivative = 0.57 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \log {\left (\log {\left (2 x - 8 \right )} \right )} \]
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Time = 0.24 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.64 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \, \log \left (\log \left (2 \, x - 8\right )\right ) \]
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Time = 0.26 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.64 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2 \, \log \left (\log \left (2 \, x - 8\right )\right ) \]
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Time = 0.26 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.64 \[ \int \frac {2}{(-4+x) \log (-8+2 x)} \, dx=2\,\ln \left (\ln \left (2\,x-8\right )\right ) \]
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