Integrand size = 14, antiderivative size = 29 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {(2+3 x) \log (2+3 x)}{3 \sqrt {-4-12 x-9 x^2}} \]
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Time = 0.00 (sec) , antiderivative size = 29, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.143, Rules used = {622, 31} \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {(3 x+2) \log (3 x+2)}{3 \sqrt {-9 x^2-12 x-4}} \]
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Rule 31
Rule 622
Rubi steps \begin{align*} \text {integral}& = -\left (-\frac {(-6-9 x) \int \frac {1}{-6-9 x} \, dx}{\sqrt {-4-12 x-9 x^2}}\right ) \\ & = \frac {(2+3 x) \log (2+3 x)}{3 \sqrt {-4-12 x-9 x^2}} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.97 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {(2+3 x) \log (2+3 x)}{3 \sqrt {-(2+3 x)^2}} \]
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Result contains complex when optimal does not.
Time = 2.22 (sec) , antiderivative size = 10, normalized size of antiderivative = 0.34
method | result | size |
meijerg | \(-\frac {i \ln \left (1+\frac {3 x}{2}\right )}{3}\) | \(10\) |
default | \(\frac {\left (2+3 x \right ) \ln \left (2+3 x \right )}{3 \sqrt {-\left (2+3 x \right )^{2}}}\) | \(25\) |
risch | \(\frac {\left (2+3 x \right ) \ln \left (2+3 x \right )}{3 \sqrt {-\left (2+3 x \right )^{2}}}\) | \(25\) |
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Result contains complex when optimal does not.
Time = 0.26 (sec) , antiderivative size = 6, normalized size of antiderivative = 0.21 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {1}{3} i \, \log \left (x + \frac {2}{3}\right ) \]
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Time = 0.41 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.83 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {\left (x + \frac {2}{3}\right ) \log {\left (x + \frac {2}{3} \right )}}{3 \sqrt {- \left (x + \frac {2}{3}\right )^{2}}} \]
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Result contains complex when optimal does not.
Time = 0.29 (sec) , antiderivative size = 6, normalized size of antiderivative = 0.21 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {1}{3} i \, \log \left (x + \frac {2}{3}\right ) \]
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Result contains complex when optimal does not.
Time = 0.27 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.79 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=\frac {i \, \log \left ({\left (-3 i \, x - 2 i\right )} \mathrm {sgn}\left (-3 \, x - 2\right )\right )}{3 \, \mathrm {sgn}\left (-3 \, x - 2\right )} \]
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Time = 9.12 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.52 \[ \int \frac {1}{\sqrt {-4-12 x-9 x^2}} \, dx=-\frac {\ln \left (-3\,x-2\right )\,\mathrm {sign}\left (3\,x+2\right )\,1{}\mathrm {i}}{3} \]
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