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