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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-2)/3 = 36 // - 36
(x^-2)/3-36 = 0
1/3*x^-2 = 36 // : 1/3
x^-2 = 108
-2 < 0
1/(x^2) = 108 // * x^2
1 = 108*x^2 // : 108
1/108 = x^2
x^2 = 1/108 // ^ 1/2
abs(x) = (1/108)^(1/2)
x = (1/108)^(1/2) or x = -(1/108)^(1/2)
x in { (1/108)^(1/2), -(1/108)^(1/2) }
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