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D( k )
(((-k)^2)/5)*k^3 = 0
(((-k)^2)/5)*k^3 = 0
(((-k)^2)/5)*k^3 = 0
1/5*k^5 = 0 // : 1/5
k^5 = 0
k = 0
k in (-oo:0) U (0:+oo)
((((-k)^2)/5)*k^3)^-3 = 0
125*k^-15 = 0 // : 125
k^-15 = 0
k należy do O
k belongs to the empty set
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