Y 4x 2xy 0. X+4/xy-x2+y+4/xy-y2. x^2+4xy+4y^4. 3x+y/x2+xy-x+3y/y2+xy. 2xy-1 4x -3y-x 6x\2.

Y 4x 2xy 0. X+4/xy-x2+y+4/xy-y2. x^2+4xy+4y^4. 3x+y/x2+xy-x+3y/y2+xy. 2xy-1 4x -3y-x 6x\2.
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