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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^1)/2-1)^2)/(x^2) = 0
((x/2-1)^2)/(x^2) = 0
((1/2*x-1)^2)/(x^2) = 0
1/2*x-1 = 0 // + 1
1/2*x = 1 // : 1/2
x = 1/1/2
x = 2
x in { 2, 2 }
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