(a-2)(a+2), a2-4, (a-3)(a+3), a2-9, (a+3)(3-a), 9-a2, (2a+5)(5-2a), 25-4a2, (2x+4)(2x-4), 4x2-16, (3x+4y)(3x-4y), 9x2-16y2, (4x-10y)(4x+10y), 16x2-100y2, (3a-12)(3a+12), 9a2-144, (a2-1)(a2+1), a4-1, (2x3+3y4)(2x3-3y4), 4x6-9y8, (3a+7)(7-3a), 49-9a2, (a+0,5)(a-0,5), a2-0,25, (a+10)(10-a), 100-a2.
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(a+b)(a-b)
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