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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
60/(x^2) > 25 // - 25
60/(x^2)-25 > 0
60*x^-2 > 25
60*x^-2 > 25 // : 60
x^-2 > 25/60
x^-2 > 5/12
1/(x^2) > 5/12
x <> 0
1/(x^2) > 5/12 // * x^4
(x^4)/(x^2) > 5/12*x^4
x^2 > 5/12*x^4
x^2-5/12*x^4 > 0
x^2*(1-5/12*x^2) > 0
x^2*(1-5/12*x^2) > 0 // : x^2
1-5/12*x^2 > 0
1 > 5/12*x^2 // : 5/12
1/5/12 > x^2
x^2 < 1/5/12 // ^ 1/2
abs(x) < (12/5)^(1/2)
x in (-(12/5)^(1/2):0) U (0:(12/5)^(1/2))
x in (-(12/5)^(1/2):0) U (0:(12/5)^(1/2))
(-(12/5)^(1/2):0) U (0:(12/5)^(1/2))
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