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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-2 >= 0
1*x^-1 >= 2
1*x^-1 >= 2 // : 1
x^-1 >= 2/1
x^-1 >= 2
1/(x^1) >= 2
x <> 0
1/(x^1) >= 2 // * x^2
(x^2)/(x^1) >= 2*x^2
x^1 >= 2*x^2
x-2*x^2 >= 0
x^1*(1-2*x) >= 0
x < 0
-(abs(x))^1*(2*(abs(x))^1+1) >= 0 // : -(abs(x))^1
2*(abs(x))^1+1 <= 0
2*(abs(x))^1 <= -1 // : 2
(abs(x))^1 <= -1/2
(abs(x))^1 <= -1/2 // ^ 1/1
abs(x) <= (-1/2)^(1/1)
abs(x) <= -1/2
x belongs to the empty set
x < 0
x > 0
x^1*(1-(2*x^1)) >= 0 // : x^1
1-(2*x^1) >= 0
1 >= 2*x^1 // : 2
1/2 >= x^1 // ^ 1/1
(1/2)^(1/1) >= x
x in (0:1/2>
x > 0
x in (0:1/2>
x in (0:1/2>
(0:1/2>
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