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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
( 1-2*x )
1-2*x > 0 // - 1
-2*x > -1 // : -2
x < -1/(-2)
x < 1/2
( 2-x^2 )
-1*x^2 > -2
-1*x^2 > -2 // * -1
1*x^2 < 2
1*x^2 < 2 // : 1
x^2 < 2/1
x^2 < 2
x^2 < 2 // ^ 1/2
abs(x) < 2^(1/2)
x in (-2^(1/2):2^(1/2))
(-oo:-2^(1/2)) (-2^(1/2):1/2) (1/2:2^(1/2)) (2^(1/2):+oo) 1-2*x + + - - 2-x^2 - + + -
x in (-2^(1/2):1/2) U (2^(1/2):+oo)
(-2^(1/2):1/2) U (2^(1/2):+oo)
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