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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)-5 = 0
1*x^-2 = 5 // : 1
x^-2 = 5
-2 < 0
1/(x^2) = 5 // * x^2
1 = 5*x^2 // : 5
1/5 = x^2
x^2 = 1/5 // ^ 1/2
abs(x) = (1/5)^(1/2)
x = (1/5)^(1/2) or x = -(1/5)^(1/2)
x in { (1/5)^(1/2), -(1/5)^(1/2) }
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