Integrand size = 20, antiderivative size = 26 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-\frac {1}{3} e^{-3 x}-\frac {e^{-2 x}}{2}-e^{-x} \]
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Time = 0.02 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.100, Rules used = {2320, 14} \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-\frac {1}{3} e^{-3 x}-\frac {e^{-2 x}}{2}-e^{-x} \]
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Rule 14
Rule 2320
Rubi steps \begin{align*} \text {integral}& = \text {Subst}\left (\int \frac {1+x+x^2}{x^4} \, dx,x,e^x\right ) \\ & = \text {Subst}\left (\int \left (\frac {1}{x^4}+\frac {1}{x^3}+\frac {1}{x^2}\right ) \, dx,x,e^x\right ) \\ & = -\frac {1}{3} e^{-3 x}-\frac {e^{-2 x}}{2}-e^{-x} \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 23, normalized size of antiderivative = 0.88 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=\frac {1}{6} e^{-3 x} \left (-2-3 e^x-6 e^{2 x}\right ) \]
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Time = 0.04 (sec) , antiderivative size = 20, normalized size of antiderivative = 0.77
method | result | size |
default | \(-\frac {{\mathrm e}^{-3 x}}{3}-\frac {{\mathrm e}^{-2 x}}{2}-{\mathrm e}^{-x}\) | \(20\) |
risch | \(-\frac {{\mathrm e}^{-3 x}}{3}-\frac {{\mathrm e}^{-2 x}}{2}-{\mathrm e}^{-x}\) | \(20\) |
parts | \(-\frac {{\mathrm e}^{-3 x}}{3}-\frac {{\mathrm e}^{-2 x}}{2}-{\mathrm e}^{-x}\) | \(20\) |
meijerg | \(\frac {11}{6}-\frac {{\mathrm e}^{-3 x}}{3}-\frac {{\mathrm e}^{-2 x}}{2}-{\mathrm e}^{-x}\) | \(21\) |
norman | \(\left (-\frac {{\mathrm e}^{2 x}}{2}-{\mathrm e}^{3 x}-\frac {{\mathrm e}^{x}}{3}\right ) {\mathrm e}^{-4 x}\) | \(23\) |
parallelrisch | \(\frac {\left (-2 \,{\mathrm e}^{x}-3 \,{\mathrm e}^{2 x}-6 \,{\mathrm e}^{3 x}\right ) {\mathrm e}^{-4 x}}{6}\) | \(26\) |
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Time = 0.31 (sec) , antiderivative size = 18, normalized size of antiderivative = 0.69 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-\frac {1}{6} \, {\left (6 \, e^{\left (2 \, x\right )} + 3 \, e^{x} + 2\right )} e^{\left (-3 \, x\right )} \]
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Time = 0.04 (sec) , antiderivative size = 22, normalized size of antiderivative = 0.85 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=- e^{- x} - \frac {e^{- 2 x}}{2} - \frac {e^{- 3 x}}{3} \]
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none
Time = 0.23 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.73 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-e^{\left (-x\right )} - \frac {1}{2} \, e^{\left (-2 \, x\right )} - \frac {1}{3} \, e^{\left (-3 \, x\right )} \]
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Time = 0.29 (sec) , antiderivative size = 18, normalized size of antiderivative = 0.69 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-\frac {1}{6} \, {\left (6 \, e^{\left (2 \, x\right )} + 3 \, e^{x} + 2\right )} e^{\left (-3 \, x\right )} \]
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Time = 0.07 (sec) , antiderivative size = 18, normalized size of antiderivative = 0.69 \[ \int e^{-4 x} \left (e^x+e^{2 x}+e^{3 x}\right ) \, dx=-\frac {{\mathrm {e}}^{-3\,x}\,\left (6\,{\mathrm {e}}^{2\,x}+3\,{\mathrm {e}}^x+2\right )}{6} \]
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