Integrand size = 19, antiderivative size = 138 \[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=-\frac {3 e^c x^2}{4 b^3 \sqrt {\pi }}+\frac {e^c x^4}{4 b \sqrt {\pi }}-\frac {3 e^{c+b^2 x^2} x \text {erfc}(b x)}{4 b^4}+\frac {e^{c+b^2 x^2} x^3 \text {erfc}(b x)}{2 b^2}+\frac {3 e^c \sqrt {\pi } \text {erfi}(b x)}{8 b^5}-\frac {3 e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{4 b^3 \sqrt {\pi }} \]
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Time = 0.11 (sec) , antiderivative size = 138, normalized size of antiderivative = 1.00, number of steps used = 9, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.316, Rules used = {6521, 6512, 2235, 6511, 12, 30} \[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=-\frac {3 e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{4 \sqrt {\pi } b^3}+\frac {3 \sqrt {\pi } e^c \text {erfi}(b x)}{8 b^5}-\frac {3 e^c x^2}{4 \sqrt {\pi } b^3}+\frac {x^3 e^{b^2 x^2+c} \text {erfc}(b x)}{2 b^2}-\frac {3 x e^{b^2 x^2+c} \text {erfc}(b x)}{4 b^4}+\frac {e^c x^4}{4 \sqrt {\pi } b} \]
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Rule 12
Rule 30
Rule 2235
Rule 6511
Rule 6512
Rule 6521
Rubi steps \begin{align*} \text {integral}& = \frac {e^{c+b^2 x^2} x^3 \text {erfc}(b x)}{2 b^2}-\frac {3 \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx}{2 b^2}+\frac {\int e^c x^3 \, dx}{b \sqrt {\pi }} \\ & = -\frac {3 e^{c+b^2 x^2} x \text {erfc}(b x)}{4 b^4}+\frac {e^{c+b^2 x^2} x^3 \text {erfc}(b x)}{2 b^2}+\frac {3 \int e^{c+b^2 x^2} \text {erfc}(b x) \, dx}{4 b^4}-\frac {3 \int e^c x \, dx}{2 b^3 \sqrt {\pi }}+\frac {e^c \int x^3 \, dx}{b \sqrt {\pi }} \\ & = \frac {e^c x^4}{4 b \sqrt {\pi }}-\frac {3 e^{c+b^2 x^2} x \text {erfc}(b x)}{4 b^4}+\frac {e^{c+b^2 x^2} x^3 \text {erfc}(b x)}{2 b^2}+\frac {3 \int e^{c+b^2 x^2} \, dx}{4 b^4}-\frac {3 \int e^{c+b^2 x^2} \text {erf}(b x) \, dx}{4 b^4}-\frac {\left (3 e^c\right ) \int x \, dx}{2 b^3 \sqrt {\pi }} \\ & = -\frac {3 e^c x^2}{4 b^3 \sqrt {\pi }}+\frac {e^c x^4}{4 b \sqrt {\pi }}-\frac {3 e^{c+b^2 x^2} x \text {erfc}(b x)}{4 b^4}+\frac {e^{c+b^2 x^2} x^3 \text {erfc}(b x)}{2 b^2}+\frac {3 e^c \sqrt {\pi } \text {erfi}(b x)}{8 b^5}-\frac {3 e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{4 b^3 \sqrt {\pi }} \\ \end{align*}
Time = 0.28 (sec) , antiderivative size = 147, normalized size of antiderivative = 1.07 \[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=-\frac {e^c \left (6 b e^{b^2 x^2} \sqrt {\pi } x+6 b^2 x^2-4 b^3 e^{b^2 x^2} \sqrt {\pi } x^3-2 b^4 x^4+2 b e^{b^2 x^2} \sqrt {\pi } x \left (-3+2 b^2 x^2\right ) \text {erf}(b x)-3 \pi \text {erfi}(b x)+3 \pi \text {erf}(b x) \text {erfi}(b x)-6 b^2 x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )\right )}{8 b^5 \sqrt {\pi }} \]
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\[\int {\mathrm e}^{b^{2} x^{2}+c} x^{4} \operatorname {erfc}\left (b x \right )d x\]
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\[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=\int { x^{4} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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Timed out. \[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=\text {Timed out} \]
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\[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=\int { x^{4} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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\[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=\int { x^{4} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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Timed out. \[ \int e^{c+b^2 x^2} x^4 \text {erfc}(b x) \, dx=\int x^4\,{\mathrm {e}}^{b^2\,x^2+c}\,\mathrm {erfc}\left (b\,x\right ) \,d x \]
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