Integrand size = 10, antiderivative size = 27 \[ \int e^{-3 x} \cos (2 x) \, dx=-\frac {3}{13} e^{-3 x} \cos (2 x)+\frac {2}{13} e^{-3 x} \sin (2 x) \]
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Time = 0.01 (sec) , antiderivative size = 27, normalized size of antiderivative = 1.00, number of steps used = 1, number of rules used = 1, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.100, Rules used = {4518} \[ \int e^{-3 x} \cos (2 x) \, dx=\frac {2}{13} e^{-3 x} \sin (2 x)-\frac {3}{13} e^{-3 x} \cos (2 x) \]
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Rule 4518
Rubi steps \begin{align*} \text {integral}& = -\frac {3}{13} e^{-3 x} \cos (2 x)+\frac {2}{13} e^{-3 x} \sin (2 x) \\ \end{align*}
Time = 0.03 (sec) , antiderivative size = 22, normalized size of antiderivative = 0.81 \[ \int e^{-3 x} \cos (2 x) \, dx=\frac {1}{13} e^{-3 x} (-3 \cos (2 x)+2 \sin (2 x)) \]
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Time = 0.10 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.74
method | result | size |
parallelrisch | \(\frac {{\mathrm e}^{-3 x} \left (-3 \cos \left (2 x \right )+2 \sin \left (2 x \right )\right )}{13}\) | \(20\) |
default | \(-\frac {3 \,{\mathrm e}^{-3 x} \cos \left (2 x \right )}{13}+\frac {2 \,{\mathrm e}^{-3 x} \sin \left (2 x \right )}{13}\) | \(22\) |
norman | \(\frac {\left (-\frac {3}{13}+\frac {3 \left (\tan ^{2}\left (x \right )\right )}{13}+\frac {4 \tan \left (x \right )}{13}\right ) {\mathrm e}^{-3 x}}{1+\tan ^{2}\left (x \right )}\) | \(28\) |
risch | \(-\frac {3 \,{\mathrm e}^{\left (-3+2 i\right ) x}}{26}-\frac {i {\mathrm e}^{\left (-3+2 i\right ) x}}{13}-\frac {3 \,{\mathrm e}^{\left (-3-2 i\right ) x}}{26}+\frac {i {\mathrm e}^{\left (-3-2 i\right ) x}}{13}\) | \(36\) |
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none
Time = 0.25 (sec) , antiderivative size = 21, normalized size of antiderivative = 0.78 \[ \int e^{-3 x} \cos (2 x) \, dx=-\frac {3}{13} \, \cos \left (2 \, x\right ) e^{\left (-3 \, x\right )} + \frac {2}{13} \, e^{\left (-3 \, x\right )} \sin \left (2 \, x\right ) \]
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Time = 0.17 (sec) , antiderivative size = 26, normalized size of antiderivative = 0.96 \[ \int e^{-3 x} \cos (2 x) \, dx=\frac {2 e^{- 3 x} \sin {\left (2 x \right )}}{13} - \frac {3 e^{- 3 x} \cos {\left (2 x \right )}}{13} \]
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none
Time = 0.20 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.70 \[ \int e^{-3 x} \cos (2 x) \, dx=-\frac {1}{13} \, {\left (3 \, \cos \left (2 \, x\right ) - 2 \, \sin \left (2 \, x\right )\right )} e^{\left (-3 \, x\right )} \]
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none
Time = 0.29 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.70 \[ \int e^{-3 x} \cos (2 x) \, dx=-\frac {1}{13} \, {\left (3 \, \cos \left (2 \, x\right ) - 2 \, \sin \left (2 \, x\right )\right )} e^{\left (-3 \, x\right )} \]
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Time = 0.04 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.70 \[ \int e^{-3 x} \cos (2 x) \, dx=-\frac {{\mathrm {e}}^{-3\,x}\,\left (3\,\cos \left (2\,x\right )-2\,\sin \left (2\,x\right )\right )}{13} \]
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