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