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((2*x-1)*(x^2+x+1)-((2*x+1)*(x^2-x+1)))/((x^2+x+1)^2)
1.4/4.3
77;6
(2*x-1)*(x^2+x+1)-(((2*x+1)*(x^2-x+1))/((x^2+x+1)^2))
((2*x-1)*(x^2+x+1)-((2*x+1)*(x^2-x+1)))/((x^2+x+1)^2)
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