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D( x )
(x-8)^2 = 0
(x-8)^2 = 0
(x-8)^2 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
400/((x-8)^2) = 0
400 = 0
x belongs to the empty set
x belongs to the empty set
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