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(y^2-1)^2-6(y^2-1)+9 Let Y & sup2; - 1 = t t²-6t+9 =(t-3)² The original formula = (Y & sup2; - 1-3) & sup2; = (Y & sup2; - 4) & sup2; = {(y + 2) (Y-2)} & sup2;
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