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D( x )
(1-x)^2 = 0
(1-x)^2 = 0
(1-x)^2 = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
((2*x)^2)/((1-x)^2) = 0
(4*x^2)/((1-x)^2) = 0
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x = 0
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