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D( x )
x = 0
x^(-1/3)*y^(1/2) = 0
x = 0
x = 0
x^(-1/3)*y^(1/2) = 0
x^(-1/3)*y^(1/2) = 0
x^(-1/3)*y^(1/2) = 0 // : y^(1/2)
x^(-1/3) = 0
x należy do O
x in (-oo:0) U (0:+oo)
(x^(2/3)*y^(5/6))/(x^(-1/3)*y^(1/2)) = 0
x*y^(1/3) = 0 // : y^(1/3)
x = 0
x in { 0}
x belongs to the empty set
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