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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*x-1)^2)+2*x^2 = 0
(-2*x)/((2*x-1)^2)+(2*x^2*(2*x-1)^2)/((2*x-1)^2) = 0
2*x^2*(2*x-1)^2-2*x = 0
8*x^4-8*x^3+2*x^2-2*x = 0
8*x^4-8*x^3+2*x^2-2*x = 0
2*x*(4*x^3-4*x^2+x-1) = 0
4*x^3-4*x^2+x-1
4*x^3-1*(4*x^2+1)+x
x*(4*x^2+1)-1*(4*x^2+1)
(x-1)*(4*x^2+1)
2*x*(x-1)*(4*x^2+1) = 0
(2*x*(x-1)*(4*x^2+1))/((2*x-1)^2) = 0
(2*x*(x-1)*(4*x^2+1))/((2*x-1)^2) = 0 // * (2*x-1)^2
2*x*(x-1)*(4*x^2+1) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( 4*x^2+1 )
4*x^2 = -1 // : 4
x^2 = -1/4
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 0, 1 }
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