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D( x )
(3*x^2-48)^1 = 0
(3*x^2-48)^1 = 0
(3*x^2-48)^1 = 0
3*x^2-48 = 0
3*x^2 = 48 // : 3
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in (-oo:-4) U (-4:4) U (4:+oo)
(1/((3*x^2-48)^1))/3 = 0
(1/(3*x^2-48))/3 = 0
1/(3*(3*x^2-48)) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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