(x+2)2 - x2+2x+4, (y-x)2 - y2-2yx+x2, (2x+1)2 - 4x2+4x+1, (2x-1)2 - 4x2-4x+1, (x+3)(x-3) - X2-9, (x+3)2 - x2+6x+9, (2+x)(2-x) - 4-x2,

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