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D( x )
(3*x^2)^1 = 0
(3*x^2)^1 = 0
(3*x^2)^1 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((12*x^3)/((3*x^2)^1))/3 = 0
((12*x^3)/(3*x^2))/3 = 0
4/3*x = 0 // : 4/3
x = 0
x in { 0}
x belongs to the empty set
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