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X x1. X2+XY+y2. X 2 +Y 2 =2x+2y+XY. Y-XY'=1+X^2y'. (1-X^2)Y''-XY=2.
X2+XY+y2. X 2 +Y 2 =2x+2y+XY. Y-XY'=1+X^2y'. (1-X^2)Y''-XY=2.

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