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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-2)/3 = 1/16 // - 1/16
(x^-2)/3-(1/16) = 0
(x^-2)/3-1/16 = 0
1/3*x^-2 = 1/16 // : 1/3
x^-2 = 3/16
-2 < 0
1/(x^2) = 3/16 // * x^2
1 = 3/16*x^2 // : 3/16
16/3 = x^2
x^2 = 16/3 // ^ 1/2
abs(x) = (16/3)^(1/2)
x = (16/3)^(1/2) or x = -(16/3)^(1/2)
x in { (16/3)^(1/2), -(16/3)^(1/2) }
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