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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)
11*n+6/(n^2) = 0
11*n+6*n^-2 = 0
n*(6*n^-3+11) = 0
6*n^-3 = -11 // : 6
n^-3 = -11/6
-3 < 0
1/(n^3) = -11/6 // * n^3
1 = -11/6*n^3 // : -11/6
-6/11 = n^3
n^3 = -6/11 // ^ 1/3
n = -(6/11)^(1/3)
n = 0
n = 0
n in { 0}
n = -(6/11)^(1/3)
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