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D( k )
k^-3 = 0
k = 0
k^-3 = 0
k^-3 = 0
1*k^-3 = 0 // : 1
k^-3 = 0
k naleu017Cy do O
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(2*k^5)/(k^-3) = 0
2*k^8 = 0 // : 2
k^8 = 0
k = 0
k in { 0}
k belongs to the empty set
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