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D( x )
9*(x^2-4)^(4/3) = 0
9*(x^2-4)^(4/3) = 0
9*(x^2-4)^(4/3) = 0
1*x^2 = 4 // : 1
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*(x^2-12))/(9*(x^2-4)^(4/3)) = 0
1*x^2 = 12 // : 1
x^2 = 12
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x in { 2*3^(1/2), -(2*3^(1/2)) }
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