Images X2 Y2 3 X Y A

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X2 y2 3 x y a. X 2 +Y 2 =2x+2y+XY. X2y+x+xy2+y+2xy+2. (X^2+Y^2)^2=2xy. X2-y2/2x -2xy+XY-y2.
X 2 +Y 2 =2x+2y+XY. X2y+x+xy2+y+2xy+2. (X^2+Y^2)^2=2xy. X2-y2/2x -2xy+XY-y2.

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