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D( x )
x = 0
z^3 = 0
(x^-2*y)/(z^3) = 0
x = 0
x = 0
z^3 = 0
z^3 = 0
z^3 = 0
x należy do R
(x^-2*y)/(z^3) = 0
(x^-2*y)/(z^3) = 0
x^-2*y*z^-3 = 0 // : y*z^-3
x^-2 = 0
x należy do O
x belongs to the empty set
((x^-2*y)/(z^3))^-2 = 0
x belongs to the empty set
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