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