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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)
-1/(x^2) = -1/60 // + -1/60
-1/(x^2)-(-1/60) = 0
1/60-1/(x^2) = 0
-1*x^-2 = -1/60 // : -1
x^-2 = 1/60
-2 < 0
1/(x^2) = 1/60 // * x^2
1 = 1/60*x^2 // : 1/60
60 = x^2
x^2 = 60 // ^ 1/2
abs(x) = 2*15^(1/2)
x = 2*15^(1/2) or x = -(2*15^(1/2))
x in { 2*15^(1/2), -(2*15^(1/2)) }
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