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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)-4 = 0
1*x^-2 = 4 // : 1
x^-2 = 4
-2 < 0
1/(x^2) = 4 // * x^2
1 = 4*x^2 // : 4
1/4 = x^2
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
x in { 1/2, -1/2 }
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