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D( k )
8*k^5 = 0
8*k^5 = 0
8*k^5 = 0
8*k^5 = 0 // : 8
k^5 = 0
k = 0
k in (-oo:0) U (0:+oo)
(4*k^2)/(8*k^5) = 0
1/2*k^-3 = 0 // : 1/2
k^-3 = 0
k należy do O
k belongs to the empty set
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