Integrand size = 7, antiderivative size = 16 \[ \int e^{-t} t \, dt=-e^{-t}-e^{-t} t \]
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Time = 0.01 (sec) , antiderivative size = 16, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.286, Rules used = {2207, 2225} \[ \int e^{-t} t \, dt=-e^{-t} t-e^{-t} \]
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Rule 2207
Rule 2225
Rubi steps \begin{align*} \text {integral}& = -e^{-t} t+\int e^{-t} \, dt \\ & = -e^{-t}-e^{-t} t \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 11, normalized size of antiderivative = 0.69 \[ \int e^{-t} t \, dt=e^{-t} (-1-t) \]
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Time = 0.02 (sec) , antiderivative size = 10, normalized size of antiderivative = 0.62
method | result | size |
gosper | \(-\left (1+t \right ) {\mathrm e}^{-t}\) | \(10\) |
norman | \(\left (-1-t \right ) {\mathrm e}^{-t}\) | \(11\) |
risch | \(\left (-1-t \right ) {\mathrm e}^{-t}\) | \(11\) |
parallelrisch | \(\left (-1-t \right ) {\mathrm e}^{-t}\) | \(11\) |
meijerg | \(1-\frac {\left (2+2 t \right ) {\mathrm e}^{-t}}{2}\) | \(14\) |
default | \(-{\mathrm e}^{-t}-t \,{\mathrm e}^{-t}\) | \(15\) |
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none
Time = 0.23 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.56 \[ \int e^{-t} t \, dt=-{\left (t + 1\right )} e^{\left (-t\right )} \]
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Time = 0.03 (sec) , antiderivative size = 7, normalized size of antiderivative = 0.44 \[ \int e^{-t} t \, dt=\left (- t - 1\right ) e^{- t} \]
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none
Time = 0.19 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.56 \[ \int e^{-t} t \, dt=-{\left (t + 1\right )} e^{\left (-t\right )} \]
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none
Time = 0.30 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.56 \[ \int e^{-t} t \, dt=-{\left (t + 1\right )} e^{\left (-t\right )} \]
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Time = 0.02 (sec) , antiderivative size = 9, normalized size of antiderivative = 0.56 \[ \int e^{-t} t \, dt=-{\mathrm {e}}^{-t}\,\left (t+1\right ) \]
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