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D( n )
n*((6*n^2)/3) = 0
n*((6*n^2)/3) = 0
n*((6*n^2)/3) = 0
2*n^3 = 0 // : 2
n^3 = 0
n = 0
n in (-oo:0) U (0:+oo)
(n*((6*n^2)/3))^-3 = 0
1/8*n^-9 = 0 // : 1/8
n^-9 = 0
n należy do O
n belongs to the empty set
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