Integrand size = 16, antiderivative size = 48 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {1}{9} \sqrt {-4-12 x-9 x^2}-\frac {2 (2+3 x) \log (2+3 x)}{9 \sqrt {-4-12 x-9 x^2}} \]
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Time = 0.01 (sec) , antiderivative size = 48, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.188, Rules used = {654, 622, 31} \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {1}{9} \sqrt {-9 x^2-12 x-4}-\frac {2 (3 x+2) \log (3 x+2)}{9 \sqrt {-9 x^2-12 x-4}} \]
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Rule 31
Rule 622
Rule 654
Rubi steps \begin{align*} \text {integral}& = -\frac {1}{9} \sqrt {-4-12 x-9 x^2}-\frac {2}{3} \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx \\ & = -\frac {1}{9} \sqrt {-4-12 x-9 x^2}+-\frac {(2 (-6-9 x)) \int \frac {1}{-6-9 x} \, dx}{3 \sqrt {-4-12 x-9 x^2}} \\ & = -\frac {1}{9} \sqrt {-4-12 x-9 x^2}-\frac {2 (2+3 x) \log (2+3 x)}{9 \sqrt {-4-12 x-9 x^2}} \\ \end{align*}
Time = 1.01 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.73 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {(2+3 x) (2+3 x-2 \log (2+3 x))}{9 \sqrt {-(2+3 x)^2}} \]
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Result contains complex when optimal does not.
Time = 2.08 (sec) , antiderivative size = 16, normalized size of antiderivative = 0.33
method | result | size |
meijerg | \(-\frac {2 i \left (\frac {3 x}{2}-\ln \left (1+\frac {3 x}{2}\right )\right )}{9}\) | \(16\) |
default | \(-\frac {\left (2+3 x \right ) \left (-3 x +2 \ln \left (2+3 x \right )\right )}{9 \sqrt {-\left (2+3 x \right )^{2}}}\) | \(31\) |
risch | \(\frac {\left (2+3 x \right ) x}{3 \sqrt {-\left (2+3 x \right )^{2}}}-\frac {2 \left (2+3 x \right ) \ln \left (2+3 x \right )}{9 \sqrt {-\left (2+3 x \right )^{2}}}\) | \(45\) |
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Result contains complex when optimal does not.
Time = 0.25 (sec) , antiderivative size = 10, normalized size of antiderivative = 0.21 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {1}{3} i \, x + \frac {2}{9} i \, \log \left (x + \frac {2}{3}\right ) \]
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Time = 0.49 (sec) , antiderivative size = 44, normalized size of antiderivative = 0.92 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=- \frac {\sqrt {- 9 x^{2} - 12 x - 4}}{9} - \frac {2 \left (x + \frac {2}{3}\right ) \log {\left (x + \frac {2}{3} \right )}}{9 \sqrt {- \left (x + \frac {2}{3}\right )^{2}}} \]
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Result contains complex when optimal does not.
Time = 0.28 (sec) , antiderivative size = 21, normalized size of antiderivative = 0.44 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {1}{9} \, \sqrt {-9 \, x^{2} - 12 \, x - 4} - \frac {2}{9} i \, \log \left (x + \frac {2}{3}\right ) \]
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Result contains complex when optimal does not.
Time = 0.27 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.60 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {i \, x}{3 \, \mathrm {sgn}\left (-3 \, x - 2\right )} - \frac {2 i \, \log \left ({\left | 3 \, x + 2 \right |}\right )}{9 \, \mathrm {sgn}\left (-3 \, x - 2\right )} \]
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Time = 10.02 (sec) , antiderivative size = 36, normalized size of antiderivative = 0.75 \[ \int \frac {x}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {\sqrt {-9\,x^2-12\,x-4}}{9}+\frac {\ln \left (x+\frac {2}{3}-\frac {\sqrt {-{\left (3\,x+2\right )}^2}\,1{}\mathrm {i}}{3}\right )\,2{}\mathrm {i}}{9} \]
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