(a+b)2 - a2+2ab+b2, (a-b)2 - a2-2ab+b2, (a+b)(a-b) - a2-b2, (x+3)2 - x2+6x+9, (2x-4)2 - 4x2-16x+16, (x+6)(x-6) - x2-36, 4x2+12x+9 - (2x+3)2, (xy)2+10xy+25 - (xy+5)2, 9x2-42xy+49y2 - (3x-7y)2, 81-18x+x2 - (9-x)2, x2-64 - (x+8)(x-8), 9x2-16 - (3x+4)(3x-4), x2+22x+121 - (x+11)2, x2-14xy+49y2 - (x-7y)2, 4x2-81 - (2x+9)(2x-9), 3x(4+6x) - 12x+18x2, xy(2+x) - 2xy+x2y, 5x(3x-2) - 15x2-10x, 9x2-36x+36 - (3x-6)2, 144x2-144x+36 - (12x-6)2,

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