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D( n )
9*n^6 < 0
9*n^6 < 0
9*n^6 < 0
9*n^6 < 0
9*n^6 < 0 // : 9
n^6 < 0/9
n^6 < 0
n belongs to the empty set
n in (-oo:+oo)
(9*n^6)^(1/2) = 0
3*n^3 = 0 // : 3
n^3 = 0
n = 0
n = 0
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