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D( x )
x^2-(4*x)+4 = 0
x^2-(4*x)+4 = 0
x^2-(4*x)+4 = 0
x^2-4*x+4 = 0
x^2-4*x+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
x = 4/(1*2)
x = 2 or x = 2
x in (-oo:2) U (2:+oo)
(x+1)/(x^2-(4*x)+4) = 0
(x+1)/(x^2-4*x+4) = 0
x^2-4*x+4 = 0
x^2-4*x+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
x = 4/(1*2)
x = 2 or x = 2
(x-2)^2 = 0
(x+1)/((x-2)^2) = 0
x+1 = 0 // - 1
x = -1
x = -1
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