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D( x )
(x^2-3)^2 = 0
(x^2-3)^2 = 0
(x^2-3)^2 = 0
1*x^2 = 3 // : 1
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in (-oo:-3^(1/2)) U (-3^(1/2):3^(1/2)) U (3^(1/2):+oo)
(x^2-27)/((x^2-3)^2) = 0
1*x^2 = 27 // : 1
x^2 = 27
x^2 = 27 // ^ 1/2
abs(x) = 3*3^(1/2)
x = 3*3^(1/2) or x = -(3*3^(1/2))
x in { 3*3^(1/2), -(3*3^(1/2)) }
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