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D( n )
n = 0
2*n^-4 = 0
n = 0
n = 0
2*n^-4 = 0
2*n^-4 = 0
2*n^-4 = 0 // : 2
n^-4 = 0
n należy do O
n in (-oo:0) U (0:+oo)
1/(2*n^-4) = 0
1/2*n^4 = 0 // : 1/2
n^4 = 0
n = 0
n in { 0}
n belongs to the empty set
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