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