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D( x )
3*x*x = 0
3*x*x = 0
3*x*x = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
h = 372/(3*x*x) // - 372/(3*x*x)
h-(372/(3*x*x)) = 0
h-124*x^-2 = 0
-124*x^-2 = -h // : -124
x^-2 = h/124
-2 < 0
1/(x^2) = h/124 // * x^2
1 = (h/124)*x^2 // : h/124
124*h^-1 = x^2
x^2 = 124*h^-1 // ^ 1/2
abs(x) = 2*31^(1/2)*h^(-1/2)
x = 2*31^(1/2)*h^(-1/2) or x = -(2*31^(1/2)*h^(-1/2))
x in { 2*31^(1/2)*h^(-1/2), -(2*31^(1/2)*h^(-1/2)) }
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