Integrand size = 19, antiderivative size = 95 \[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\frac {e^c x^2}{2 b \sqrt {\pi }}+\frac {e^{c+b^2 x^2} x \text {erfc}(b x)}{2 b^2}-\frac {e^c \sqrt {\pi } \text {erfi}(b x)}{4 b^3}+\frac {e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 b \sqrt {\pi }} \]
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Time = 0.07 (sec) , antiderivative size = 95, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.316, Rules used = {6521, 6512, 2235, 6511, 12, 30} \[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\frac {e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 \sqrt {\pi } b}-\frac {\sqrt {\pi } e^c \text {erfi}(b x)}{4 b^3}+\frac {x e^{b^2 x^2+c} \text {erfc}(b x)}{2 b^2}+\frac {e^c x^2}{2 \sqrt {\pi } b} \]
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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 \text {erfc}(b x)}{2 b^2}-\frac {\int e^{c+b^2 x^2} \text {erfc}(b x) \, dx}{2 b^2}+\frac {\int e^c x \, dx}{b \sqrt {\pi }} \\ & = \frac {e^{c+b^2 x^2} x \text {erfc}(b x)}{2 b^2}-\frac {\int e^{c+b^2 x^2} \, dx}{2 b^2}+\frac {\int e^{c+b^2 x^2} \text {erf}(b x) \, dx}{2 b^2}+\frac {e^c \int x \, dx}{b \sqrt {\pi }} \\ & = \frac {e^c x^2}{2 b \sqrt {\pi }}+\frac {e^{c+b^2 x^2} x \text {erfc}(b x)}{2 b^2}-\frac {e^c \sqrt {\pi } \text {erfi}(b x)}{4 b^3}+\frac {e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 b \sqrt {\pi }} \\ \end{align*}
Time = 0.22 (sec) , antiderivative size = 104, normalized size of antiderivative = 1.09 \[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=-\frac {e^c \left (-2 b e^{b^2 x^2} \sqrt {\pi } x-2 b^2 x^2+\pi \text {erfi}(b x)+\text {erf}(b x) \left (2 b e^{b^2 x^2} \sqrt {\pi } x-\pi \text {erfi}(b x)\right )+2 b^2 x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )\right )}{4 b^3 \sqrt {\pi }} \]
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\[\int {\mathrm e}^{b^{2} x^{2}+c} x^{2} \operatorname {erfc}\left (b x \right )d x\]
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\[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\int { x^{2} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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Result contains complex when optimal does not.
Time = 28.60 (sec) , antiderivative size = 65, normalized size of antiderivative = 0.68 \[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=- \frac {b x^{4} e^{c} {{}_{2}F_{2}\left (\begin {matrix} 1, 2 \\ \frac {3}{2}, 3 \end {matrix}\middle | {b^{2} x^{2}} \right )}}{2 \sqrt {\pi }} + \frac {x e^{c} e^{b^{2} x^{2}}}{2 b^{2}} + \frac {i \sqrt {\pi } e^{c} \operatorname {erf}{\left (i b x \right )}}{4 b^{3}} \]
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\[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\int { x^{2} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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\[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\int { x^{2} \operatorname {erfc}\left (b x\right ) e^{\left (b^{2} x^{2} + c\right )} \,d x } \]
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Timed out. \[ \int e^{c+b^2 x^2} x^2 \text {erfc}(b x) \, dx=\int x^2\,{\mathrm {e}}^{b^2\,x^2+c}\,\mathrm {erfc}\left (b\,x\right ) \,d x \]
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