factorize (x + y)2 – 4xy
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2x - 4xsq y - 2y - 4xy sq
(2x - 4xsq y) + (2y - 4xy sq)
2x ( 1 - 2xy ) 2y ( 1 - 2xy )
( 2x + 2y ) ( 1 - 2xy )
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