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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-2)/y)^2 = 0
x^-4*y^-2 = 0 // : y^-2
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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