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D( x )
x = 0
x^-2 = 0
x = 0
x = 0
x^-2 = 0
x^-2 = 0
1*x^-2 = 0 // : 1
x^-2 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(x^-3*y^(43^-2))/(x^-2) = 0
x^-1*y^(1/1849) = 0 // : y^(1/1849)
x^-1 = 0
x należy do O
x belongs to the empty set
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