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D( x )
(0.5-(2*x))^2 = 0
(0.5-(2*x))^2 = 0
(0.5-(2*x))^2 = 0
(0.5-2*x)^2 = 0
0.5-2*x = 0 // - 0.5
-2*x = -0.5 // : -2
x = -0.5/(-2)
x = 0.25
x in (-oo:0.25) U (0.25:+oo)
(((2*x)^2)/((0.5-(2*x))^2))*(0.5-x) = 0
(((2*x)^2)/((0.5-2*x)^2))*(0.5-x) = 0
(4*x^2*(0.5-x))/((0.5-2*x)^2) = 0
( 0.5-x )
0.5-x = 0 // - 0.5
-x = -0.5 // * -1
x = 0.5
( 4*x^2 )
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x in { 0.5, 0 }
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