Integrand size = 9, antiderivative size = 44 \[ \int a^{3 x} x^2 \, dx=\frac {2 a^{3 x}}{27 \log ^3(a)}-\frac {2 a^{3 x} x}{9 \log ^2(a)}+\frac {a^{3 x} x^2}{3 \log (a)} \]
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Time = 0.01 (sec) , antiderivative size = 44, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.222, Rules used = {2207, 2225} \[ \int a^{3 x} x^2 \, dx=\frac {x^2 a^{3 x}}{3 \log (a)}+\frac {2 a^{3 x}}{27 \log ^3(a)}-\frac {2 x a^{3 x}}{9 \log ^2(a)} \]
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Rule 2207
Rule 2225
Rubi steps \begin{align*} \text {integral}& = \frac {a^{3 x} x^2}{3 \log (a)}-\frac {2 \int a^{3 x} x \, dx}{3 \log (a)} \\ & = -\frac {2 a^{3 x} x}{9 \log ^2(a)}+\frac {a^{3 x} x^2}{3 \log (a)}+\frac {2 \int a^{3 x} \, dx}{9 \log ^2(a)} \\ & = \frac {2 a^{3 x}}{27 \log ^3(a)}-\frac {2 a^{3 x} x}{9 \log ^2(a)}+\frac {a^{3 x} x^2}{3 \log (a)} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.66 \[ \int a^{3 x} x^2 \, dx=\frac {a^{3 x} \left (2-6 x \log (a)+9 x^2 \log ^2(a)\right )}{27 \log ^3(a)} \]
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Time = 0.03 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.64
method | result | size |
gosper | \(\frac {\left (9 x^{2} \ln \left (a \right )^{2}-6 x \ln \left (a \right )+2\right ) a^{3 x}}{27 \ln \left (a \right )^{3}}\) | \(28\) |
risch | \(\frac {\left (9 x^{2} \ln \left (a \right )^{2}-6 x \ln \left (a \right )+2\right ) a^{3 x}}{27 \ln \left (a \right )^{3}}\) | \(28\) |
meijerg | \(-\frac {2-\frac {\left (27 x^{2} \ln \left (a \right )^{2}-18 x \ln \left (a \right )+6\right ) {\mathrm e}^{3 x \ln \left (a \right )}}{3}}{27 \ln \left (a \right )^{3}}\) | \(33\) |
parallelrisch | \(\frac {9 x^{2} a^{3 x} \ln \left (a \right )^{2}-6 x \,a^{3 x} \ln \left (a \right )+2 a^{3 x}}{27 \ln \left (a \right )^{3}}\) | \(39\) |
norman | \(\frac {2 \,{\mathrm e}^{3 x \ln \left (a \right )}}{27 \ln \left (a \right )^{3}}-\frac {2 x \,{\mathrm e}^{3 x \ln \left (a \right )}}{9 \ln \left (a \right )^{2}}+\frac {x^{2} {\mathrm e}^{3 x \ln \left (a \right )}}{3 \ln \left (a \right )}\) | \(42\) |
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none
Time = 0.23 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.61 \[ \int a^{3 x} x^2 \, dx=\frac {{\left (9 \, x^{2} \log \left (a\right )^{2} - 6 \, x \log \left (a\right ) + 2\right )} a^{3 \, x}}{27 \, \log \left (a\right )^{3}} \]
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Time = 0.05 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.84 \[ \int a^{3 x} x^2 \, dx=\begin {cases} \frac {a^{3 x} \left (9 x^{2} \log {\left (a \right )}^{2} - 6 x \log {\left (a \right )} + 2\right )}{27 \log {\left (a \right )}^{3}} & \text {for}\: \log {\left (a \right )}^{3} \neq 0 \\\frac {x^{3}}{3} & \text {otherwise} \end {cases} \]
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none
Time = 0.20 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.61 \[ \int a^{3 x} x^2 \, dx=\frac {{\left (9 \, x^{2} \log \left (a\right )^{2} - 6 \, x \log \left (a\right ) + 2\right )} a^{3 \, x}}{27 \, \log \left (a\right )^{3}} \]
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Result contains complex when optimal does not.
Time = 0.29 (sec) , antiderivative size = 826, normalized size of antiderivative = 18.77 \[ \int a^{3 x} x^2 \, dx=\text {Too large to display} \]
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Time = 0.06 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.61 \[ \int a^{3 x} x^2 \, dx=\frac {a^{3\,x}\,\left (9\,x^2\,{\ln \left (a\right )}^2-6\,x\,\ln \left (a\right )+2\right )}{27\,{\ln \left (a\right )}^3} \]
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