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D( x )
x = 0
x^2*y^-1 = 0
x = 0
x = 0
x^2*y^-1 = 0
x^2*y^-1 = 0
x^2*y^-1 = 0 // : y^-1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1*y^-1)/(x^2*y^-1) = 0
1*x^-3 = 0 // : 1
x^-3 = 0
x należy do O
x belongs to the empty set
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