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