1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
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1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+
1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
1.(xy-1)^2-(x+y-2xy)(2-x-y)
2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
(1) (x-1)^2 (y-1)^2
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1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
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