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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-2)/3 = 1/36 // - 1/36
(x^-2)/3-(1/36) = 0
(x^-2)/3-1/36 = 0
1/3*x^-2 = 1/36 // : 1/3
x^-2 = 1/12
-2 < 0
1/(x^2) = 1/12 // * x^2
1 = 1/12*x^2 // : 1/12
12 = x^2
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x in { 2*3^(1/2), -(2*3^(1/2)) }
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