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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(((81*k^-3)^2)/9)*k^9 = 0
729*k^3 = 0 // : 729
k^3 = 0
k = 0
k in { 0}
k belongs to the empty set
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