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D( k )
k^3 = 0
k^3 = 0
k^3 = 0
1*k^3 = 0 // : 1
k^3 = 0
k = 0
k in (-oo:0) U (0:+oo)
27/(k^3) = 0
27*k^-3 = 0 // : 27
k^-3 = 0
k należy do O
k belongs to the empty set
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