(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)

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(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)(ax+by)^2(ay+bx)^2+2(ax+by)(ay+b

(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)
(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)

(ax+by)^2(ay+bx)^2+2(ax+by)(ay+bx)
(b x + a y) (a x + b y) (2 + (b x + a y) (a x + b y))
=2 a b x^2 + a^2 b^2 x^4 + 2 a^2 x y + 2 b^2 x y + 2 a^3 b x^3 y + 2 a b^3 x^3 y + 2 a b y^2 + a^4 x^2 y^2 + 4 a^2 b^2 x^2 y^2 + b^4 x^2 y^2 + 2 a^3 b x y^3 + 2 a b^3 x y^3 + a^2 b^2 y^4