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D( n )
n^2 = 0
n^2 = 0
n^2 = 0
1*n^2 = 0 // : 1
n^2 = 0
n = 0
n in (-oo:0) U (0:+oo)
(2*n+1/(n^2))^6 = 0
(2*n+n^-2)^6 = 0
2*n+n^-2 = 0
n*(n^-3+2) = 0
1*n^-3 = -2 // : 1
n^-3 = -2
-3 < 0
1/(n^3) = -2 // * n^3
1 = -2*n^3 // : -2
-1/2 = n^3
n^3 = -1/2 // ^ 1/3
n = -(1/2)^(1/3)
n*(n+(1/2)^(1/3)) = 0
n^6*(n+(1/2)^(1/3))^6 = 0
( n+(1/2)^(1/3) )
n+(1/2)^(1/3) = 0 // - (1/2)^(1/3)
n = -(1/2)^(1/3)
( n )
n = 0
n in { 0}
n in { -(1/2)^(1/3), -(1/2)^(1/3), -(1/2)^(1/3), -(1/2)^(1/3), -(1/2)^(1/3), -(1/2)^(1/3) }
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