(n^2-1)*(n^4+n^2+1)-(n^2-1)^3
N^6+n^4+n^2-n^4-n^2-1-n^6-3n^4+3n^2-1=
=-3n^4+3n^2-2
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N^6+n^4+n^2-n^4-n^2-1-n^6-3n^4+3n^2-1=
=-3n^4+3n^2-2