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2014-11-04T15:56:37+02:00
(x+1)^3-(x-2)^3=(x^3+3x^2+3x+1)-(x^3-6x^2+12x-8)=
=x^3+3x^2+3x+1-x^3+6x-12x+8=
=9x^2-9x+9=9(x^2-x+1)
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