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D( x )
(2*x)^2 = 0
(2*x)^2 = 0
(2*x)^2 = 0
4*x^2 = 0 // : 4
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
3/16 = 1/((2*x)^2) // - 1/((2*x)^2)
3/16-(1/((2*x)^2)) = 0
3/16-(2*x)^-2 = 0
-1/4*x^-2 = -3/16 // : -1/4
x^-2 = 3/4
-2 < 0
1/(x^2) = 3/4 // * x^2
1 = 3/4*x^2 // : 3/4
4/3 = x^2
x^2 = 4/3 // ^ 1/2
abs(x) = (4/3)^(1/2)
x = (4/3)^(1/2) or x = -(4/3)^(1/2)
x in { (4/3)^(1/2), -(4/3)^(1/2) }
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