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D( x )
(3*x^2)^(1/3) = 0
(3*x^2)^(1/3) = 0
(3*x^2)^(1/3) = 0
3^(1/3)*x^(2/3) = 0 // : 3^(1/3)
x^(2/3) = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x^3)/((3*x^2)^(1/3)) = 0
(12/(3^(1/3)))*x^(7/3) = 0 // : 12/(3^(1/3))
x^(7/3) = 0
x = 0
x in { 0}
x belongs to the empty set
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