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