Integrate[z^2 Erfc[a z] Erfc[b z], z] == (z^2 (-2 Sqrt[a^2 + b^2] (a^4 + b^4) E^((a^2 + b^2) z^2) Sqrt[Pi] Sqrt[(a^2 + b^2) z^2] Erf[Sqrt[a^2 + b^2] z] + (a^2 + b^2) ((-a^2) b^2 E^((a^2 + b^2) z^2) Sqrt[Pi] z Erf[Sqrt[(a^2 + b^2) z^2]] + 2 a^3 E^(a^2 z^2) Sqrt[Pi] Sqrt[(a^2 + b^2) z^2] Erfc[a z] (-1 - b^2 z^2 + b^3 E^(b^2 z^2) Sqrt[Pi] z^3 Erfc[b z]) - b^2 ((-a^2) z (E^((a^2 + b^2) z^2) Sqrt[Pi] + 2 Sqrt[(a^2 + b^2) z^2]) + 2 b E^(b^2 z^2) Sqrt[Pi] Sqrt[(a^2 + b^2) z^2] (1 + a^2 z^2) Erfc[b z]))))/ E^((a^2 + b^2) z^2)/(6 a^3 b^3 Pi ((a^2 + b^2) z^2)^(3/2))

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</apply> <apply> <power /> <apply> <times /> <apply> <plus /> <apply> <power /> <ci> a </ci> <cn type='integer'> 2 </cn> </apply> <apply> <power /> <ci> b </ci> <cn type='integer'> 2 </cn> </apply> </apply> <apply> <power /> <ci> z </ci> <cn type='integer'> 2 </cn> </apply> </apply> <cn type='rational'> 1 <sep /> 2 </cn> </apply> <apply> <ci> Erf </ci> <apply> <times /> <apply> <power /> <apply> <plus /> <apply> <power /> <ci> a </ci> <cn type='integer'> 2 </cn> </apply> <apply> <power /> <ci> b </ci> <cn type='integer'> 2 </cn> </apply> </apply> <cn type='rational'> 1 <sep /> 2 </cn> </apply> <ci> z </ci> </apply> </apply> </apply> </apply> </apply> </apply> <apply> <power /> <apply> <times /> <cn type='integer'> 6 </cn> <apply> <power /> <ci> a </ci> <cn type='integer'> 3 </cn> </apply> <apply> <power /> <ci> b </ci> <cn type='integer'> 3 </cn> </apply> <pi /> <apply> <power /> <apply> <times /> <apply> <plus /> <apply> <power /> <ci> a </ci> <cn type='integer'> 2 </cn> </apply> 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2001-10-29