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D( n )
81*n^6 = 0
81*n^6 = 0
81*n^6 = 0
81*n^6 = 0 // : 81
n^6 = 0
n = 0
n in (-oo:0) U (0:+oo)
((81*n^6)^-1)/2 = 0
1/162*n^-6 = 0 // : 1/162
n^-6 = 0
n należy do O
n belongs to the empty set
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