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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)
6-1/(x^2) = 0
-1*x^-2 = -6 // : -1
x^-2 = 6
-2 < 0
1/(x^2) = 6 // * x^2
1 = 6*x^2 // : 6
1/6 = x^2
x^2 = 1/6 // ^ 1/2
abs(x) = (1/6)^(1/2)
x = (1/6)^(1/2) or x = -(1/6)^(1/2)
x in { (1/6)^(1/2), -(1/6)^(1/2) }
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