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