Optimal. Leaf size=135 \[ -\frac {43 \text {erf}\left (\sqrt {2} b x\right )}{32 \sqrt {2} b^6}-\frac {x^4 e^{-b^2 x^2} \text {erfc}(b x)}{2 b^2}-\frac {e^{-b^2 x^2} \text {erfc}(b x)}{b^6}+\frac {11 x e^{-2 b^2 x^2}}{16 \sqrt {\pi } b^5}-\frac {x^2 e^{-b^2 x^2} \text {erfc}(b x)}{b^4}+\frac {x^3 e^{-2 b^2 x^2}}{4 \sqrt {\pi } b^3} \]
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Rubi [A] time = 0.19, antiderivative size = 135, normalized size of antiderivative = 1.00, number of steps used = 9, number of rules used = 4, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.222, Rules used = {6386, 6383, 2205, 2212} \[ -\frac {43 \text {Erf}\left (\sqrt {2} b x\right )}{32 \sqrt {2} b^6}-\frac {x^4 e^{-b^2 x^2} \text {Erfc}(b x)}{2 b^2}-\frac {x^2 e^{-b^2 x^2} \text {Erfc}(b x)}{b^4}-\frac {e^{-b^2 x^2} \text {Erfc}(b x)}{b^6}+\frac {x^3 e^{-2 b^2 x^2}}{4 \sqrt {\pi } b^3}+\frac {11 x e^{-2 b^2 x^2}}{16 \sqrt {\pi } b^5} \]
Antiderivative was successfully verified.
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Rule 2205
Rule 2212
Rule 6383
Rule 6386
Rubi steps
\begin {align*} \int e^{-b^2 x^2} x^5 \text {erfc}(b x) \, dx &=-\frac {e^{-b^2 x^2} x^4 \text {erfc}(b x)}{2 b^2}+\frac {2 \int e^{-b^2 x^2} x^3 \text {erfc}(b x) \, dx}{b^2}-\frac {\int e^{-2 b^2 x^2} x^4 \, dx}{b \sqrt {\pi }}\\ &=\frac {e^{-2 b^2 x^2} x^3}{4 b^3 \sqrt {\pi }}-\frac {e^{-b^2 x^2} x^2 \text {erfc}(b x)}{b^4}-\frac {e^{-b^2 x^2} x^4 \text {erfc}(b x)}{2 b^2}+\frac {2 \int e^{-b^2 x^2} x \text {erfc}(b x) \, dx}{b^4}-\frac {3 \int e^{-2 b^2 x^2} x^2 \, dx}{4 b^3 \sqrt {\pi }}-\frac {2 \int e^{-2 b^2 x^2} x^2 \, dx}{b^3 \sqrt {\pi }}\\ &=\frac {11 e^{-2 b^2 x^2} x}{16 b^5 \sqrt {\pi }}+\frac {e^{-2 b^2 x^2} x^3}{4 b^3 \sqrt {\pi }}-\frac {e^{-b^2 x^2} \text {erfc}(b x)}{b^6}-\frac {e^{-b^2 x^2} x^2 \text {erfc}(b x)}{b^4}-\frac {e^{-b^2 x^2} x^4 \text {erfc}(b x)}{2 b^2}-\frac {3 \int e^{-2 b^2 x^2} \, dx}{16 b^5 \sqrt {\pi }}-\frac {\int e^{-2 b^2 x^2} \, dx}{2 b^5 \sqrt {\pi }}-\frac {2 \int e^{-2 b^2 x^2} \, dx}{b^5 \sqrt {\pi }}\\ &=\frac {11 e^{-2 b^2 x^2} x}{16 b^5 \sqrt {\pi }}+\frac {e^{-2 b^2 x^2} x^3}{4 b^3 \sqrt {\pi }}-\frac {43 \text {erf}\left (\sqrt {2} b x\right )}{32 \sqrt {2} b^6}-\frac {e^{-b^2 x^2} \text {erfc}(b x)}{b^6}-\frac {e^{-b^2 x^2} x^2 \text {erfc}(b x)}{b^4}-\frac {e^{-b^2 x^2} x^4 \text {erfc}(b x)}{2 b^2}\\ \end {align*}
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Mathematica [A] time = 0.17, size = 87, normalized size = 0.64 \[ \frac {4 e^{-2 b^2 x^2} \left (\frac {b x \left (4 b^2 x^2+11\right )}{\sqrt {\pi }}-8 e^{b^2 x^2} \left (b^4 x^4+2 b^2 x^2+2\right ) \text {erfc}(b x)\right )-43 \sqrt {2} \text {erf}\left (\sqrt {2} b x\right )}{64 b^6} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.42, size = 121, normalized size = 0.90 \[ -\frac {43 \, \sqrt {2} \pi \sqrt {b^{2}} \operatorname {erf}\left (\sqrt {2} \sqrt {b^{2}} x\right ) - 4 \, \sqrt {\pi } {\left (4 \, b^{4} x^{3} + 11 \, b^{2} x\right )} e^{\left (-2 \, b^{2} x^{2}\right )} + 32 \, {\left (\pi b^{5} x^{4} + 2 \, \pi b^{3} x^{2} + 2 \, \pi b - {\left (\pi b^{5} x^{4} + 2 \, \pi b^{3} x^{2} + 2 \, \pi b\right )} \operatorname {erf}\left (b x\right )\right )} e^{\left (-b^{2} x^{2}\right )}}{64 \, \pi b^{7}} \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int x^{5} \operatorname {erfc}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.09, size = 172, normalized size = 1.27 \[ \frac {\frac {-\frac {{\mathrm e}^{-b^{2} x^{2}} b^{4} x^{4}}{2}-{\mathrm e}^{-b^{2} x^{2}} b^{2} x^{2}-{\mathrm e}^{-b^{2} x^{2}}}{b^{5}}-\frac {\erf \left (b x \right ) \left (-\frac {{\mathrm e}^{-b^{2} x^{2}} b^{4} x^{4}}{2}-{\mathrm e}^{-b^{2} x^{2}} b^{2} x^{2}-{\mathrm e}^{-b^{2} x^{2}}\right )}{b^{5}}+\frac {-\frac {43 \sqrt {2}\, \sqrt {\pi }\, \erf \left (b x \sqrt {2}\right )}{64}+\frac {11 \,{\mathrm e}^{-2 b^{2} x^{2}} b x}{16}+\frac {{\mathrm e}^{-2 b^{2} x^{2}} b^{3} x^{3}}{4}}{\sqrt {\pi }\, b^{5}}}{b} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int x^{5} \operatorname {erfc}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [F] time = 0.00, size = -1, normalized size = -0.01 \[ \int x^5\,{\mathrm {e}}^{-b^2\,x^2}\,\mathrm {erfc}\left (b\,x\right ) \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [F(-1)] time = 0.00, size = 0, normalized size = 0.00 \[ \text {Timed out} \]
Verification of antiderivative is not currently implemented for this CAS.
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