Factorization 1-4x square-4y square + 8xy

1-4x- 4y+8xy =1-4(x+y+2xy) =1 - 4 (x+y) =1- [2(x+y)] =[1+2(x+y)][1-2(x+y)] =(2x+2y+1) (1-2x-2y)

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