1. (x^2+1-2x)*(x^2+1+2x) 2. (x^2-2x+1)*(x^2+2x+1) 3. (x-1)^2*(x+1)^2
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1. (x^2+1-2x)*(x^2+1+2x) 2. (x^2-2x+1)*(x^2+2x+1) 3. (x-1)^2*(x+1)^2