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D( x )
(x+4)^2 = 0
(x+4)^2 = 0
(x+4)^2 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
1/((x+4)^2) = 0
x belongs to the empty set
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