Optimal. Leaf size=63 \[ -\frac{x e^{-b^2 x^2} \text{Erfc}(b x)}{2 b^2}-\frac{\sqrt{\pi } \text{Erfc}(b x)^2}{8 b^3}+\frac{e^{-2 b^2 x^2}}{4 \sqrt{\pi } b^3} \]
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Rubi [A] time = 0.079704, antiderivative size = 63, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 18, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.222, Rules used = {6386, 6374, 30, 2209} \[ -\frac{x e^{-b^2 x^2} \text{Erfc}(b x)}{2 b^2}-\frac{\sqrt{\pi } \text{Erfc}(b x)^2}{8 b^3}+\frac{e^{-2 b^2 x^2}}{4 \sqrt{\pi } b^3} \]
Antiderivative was successfully verified.
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Rule 6386
Rule 6374
Rule 30
Rule 2209
Rubi steps
\begin{align*} \int e^{-b^2 x^2} x^2 \text{erfc}(b x) \, dx &=-\frac{e^{-b^2 x^2} x \text{erfc}(b x)}{2 b^2}+\frac{\int e^{-b^2 x^2} \text{erfc}(b x) \, dx}{2 b^2}-\frac{\int e^{-2 b^2 x^2} x \, dx}{b \sqrt{\pi }}\\ &=\frac{e^{-2 b^2 x^2}}{4 b^3 \sqrt{\pi }}-\frac{e^{-b^2 x^2} x \text{erfc}(b x)}{2 b^2}-\frac{\sqrt{\pi } \operatorname{Subst}(\int x \, dx,x,\text{erfc}(b x))}{4 b^3}\\ &=\frac{e^{-2 b^2 x^2}}{4 b^3 \sqrt{\pi }}-\frac{e^{-b^2 x^2} x \text{erfc}(b x)}{2 b^2}-\frac{\sqrt{\pi } \text{erfc}(b x)^2}{8 b^3}\\ \end{align*}
Mathematica [A] time = 0.115911, size = 79, normalized size = 1.25 \[ \frac{\left (4 b x e^{-b^2 x^2}+2 \sqrt{\pi }\right ) \text{Erf}(b x)+2 e^{-2 b^2 x^2} \left (\frac{1}{\sqrt{\pi }}-2 b x e^{b^2 x^2}\right )-\sqrt{\pi } \text{Erf}(b x)^2}{8 b^3} \]
Warning: Unable to verify antiderivative.
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Maple [F] time = 0.236, size = 0, normalized size = 0. \begin{align*} \int{\frac{{x}^{2}{\it erfc} \left ( bx \right ) }{{{\rm e}^{{b}^{2}{x}^{2}}}}}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int x^{2} \operatorname{erfc}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 2.14149, size = 162, normalized size = 2.57 \begin{align*} \frac{4 \,{\left (\pi b x \operatorname{erf}\left (b x\right ) - \pi b x\right )} e^{\left (-b^{2} x^{2}\right )} - \sqrt{\pi }{\left (\pi \operatorname{erf}\left (b x\right )^{2} - 2 \, \pi \operatorname{erf}\left (b x\right ) - 2 \, e^{\left (-2 \, b^{2} x^{2}\right )}\right )}}{8 \, \pi b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 12.5679, size = 63, normalized size = 1. \begin{align*} \begin{cases} - \frac{x e^{- b^{2} x^{2}} \operatorname{erfc}{\left (b x \right )}}{2 b^{2}} - \frac{\sqrt{\pi } \operatorname{erfc}^{2}{\left (b x \right )}}{8 b^{3}} + \frac{e^{- 2 b^{2} x^{2}}}{4 \sqrt{\pi } b^{3}} & \text{for}\: b \neq 0 \\\frac{x^{3}}{3} & \text{otherwise} \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int x^{2} \operatorname{erfc}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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