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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-9 > 0
1*x^-1 > 9
1*x^-1 > 9 // : 1
x^-1 > 9/1
x^-1 > 9
1/(x^1) > 9
x <> 0
1/(x^1) > 9 // * x^2
(x^2)/(x^1) > 9*x^2
x^1 > 9*x^2
x-9*x^2 > 0
x^1*(1-9*x) > 0
x < 0
-(abs(x))^1*(9*(abs(x))^1+1) > 0 // : -(abs(x))^1
9*(abs(x))^1+1 < 0
9*(abs(x))^1 < -1 // : 9
(abs(x))^1 < -1/9
(abs(x))^1 < -1/9 // ^ 1/1
abs(x) < (-1/9)^(1/1)
abs(x) < -1/9
x belongs to the empty set
x < 0
x > 0
x^1*(1-(9*x^1)) > 0 // : x^1
1-(9*x^1) > 0
1 > 9*x^1 // : 9
1/9 > x^1 // ^ 1/1
(1/9)^(1/1) > x
x in (0:1/9)
x > 0
x in (0:1/9)
x in (0:1/9)
(0:1/9)
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