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