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2014-06-19T11:06:17+03:00
(x^2-x+1)(x^2-x+1)=x^4-x^3+x^2-x^3+x^2-x+x^2-x+1=x^4-2x^3+3x^2-2x+1
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2014-06-19T11:08:02+03:00
(x^2-x+1)*(x^2-x+1) = x^4-x^3+x^2-x^3+x^2-x+x^2-x+1 = x^4-2x^3+3x^2-2x+1