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D( x )
(x-2)^3 = 0
(x-2)^3 = 0
(x-2)^3 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
8/((x-2)^3) = 0
8 = 0
x belongs to the empty set
x belongs to the empty set
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