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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^2-4)/X = 0
1*X^2 = 4 // : 1
X^2 = 4
X^2 = 4 // ^ 1/2
abs(X) = 2
X = 2 or X = -2
X in { 2, -2 }
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