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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)
1/(x^2) < 0
1*x^-2 < 0
1*x^-2 < 0 // : 1
x^-2 < 0/1
x^-2 < 0
1/(x^2) < 0
x <> 0
1/(x^2) < 0 // * x^4
(x^4)/(x^2) < 0
x^2 < 0
x belongs to the empty set
x belongs to the empty set
0
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