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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(5*((n^-4)/15)*n^3)/5 = 0
1/15*n^-1 = 0 // : 1/15
n^-1 = 0
n należy do O
n belongs to the empty set
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