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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^2)/(x^2)-x-2 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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