Images A X2 XY Y2 X Y

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A x2 xy y2 x y. X 2 +Y 2 =2x+2y+XY. `(X^2+Y^2)/2=2|X|+|Y|+2`;. X2+2xy+y2. 2^2x-x^2-1 + 1/2x-x^2-1.
X 2 +Y 2 =2x+2y+XY. `(X^2+Y^2)/2=2|X|+|Y|+2`;. X2+2xy+y2. 2^2x-x^2-1 + 1/2x-x^2-1.

See also