(x+2)2 - x2+4x+4, (3x+2)2 - 9x2+12x+4, (3-x)2 - 9-6x+x2, (2-x)2 - 4-4x+x2, (1-2x)2 - 1-4x+4x2, (2x2-1)(2x2+1) - 4x4-1, (x2-1)(x2+1) - x4-1, (2x+3)2 - 4x2+12x+9, (0,5 - 5x)2 - 0,25-5x+25x2, (7-2x)(2x+7) - 49-4x2, (5+2x)(2x-5) - 25-4x2, (5-4t)2 - 25- 40t +16t2, (a-0,6)(a+0,6) - a2-0,36, (a- 6)(6 + a) - 36 - a2,

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