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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x < 4 // - 4
1/x-4 < 0
1*x^-1 < 4
1*x^-1 < 4 // : 1
x^-1 < 4/1
x^-1 < 4
1/(x^1) < 4
x <> 0
1/(x^1) < 4 // * x^2
(x^2)/(x^1) < 4*x^2
x^1 < 4*x^2
x-4*x^2 < 0
x^1*(1-4*x) < 0
x < 0
-(abs(x))^1*(4*(abs(x))^1+1) < 0 // : -(abs(x))^1
4*(abs(x))^1+1 > 0
4*(abs(x))^1 > -1 // : 4
(abs(x))^1 > -1/4
(abs(x))^1 > -1/4 // ^ 1/1
abs(x) > (-1/4)^(1/1)
abs(x) > -1/4
x in (-oo:0)
x < 0
x > 0
x^1*(1-(4*x^1)) < 0 // : x^1
1-(4*x^1) < 0
1 < 4*x^1 // : 4
1/4 < x^1 // ^ 1/1
(1/4)^(1/1) < x
x in (1/4:+oo)
x > 0
x in (-oo:0) U (1/4:+oo)
x in (-oo:0) U (1/4:+oo)
(-oo:0) U (1/4:+oo)
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