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