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| What is this denominator appearing in all terms of indefinite integral? w120 + y1 (w121 + w122 y1) w1 = w100 + w110 x + w101 y1 + w120 x^2 + w102 y1^2 + w111 x y1 + w112 x y1^2 + w121 x^2 y1 + w122 x^2 y1^2; Expand[\[Integral]0.5*(D[w1,... |