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