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Here is the integration: \[Integral]((w110 + 2 w120 x + y1 (w111 + 2 w121 x + w112 y1 + 2 w122 x y1))^3/(12 (w120 + y1 (w121 + w122 y1)))) \[DifferentialD]y1 which gives: (1/(720 w122^6))(60 w122 (w112^3...