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