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D( z )
(4*z^2)/(z^-3) = 0
z^-3 = 0
z = 0
(4*z^2)/(z^-3) = 0
(4*z^2)/(z^-3) = 0
4*z^5 = 0 // : 4
z^5 = 0
z = 0
z^-3 = 0
z^-3 = 0
1*z^-3 = 0 // : 1
z^-3 = 0
z należy do O
z = 0
z = 0
z in (-oo:0) U (0:+oo)
((4*z^2)/(z^-3))^-2 = 0
1/16*z^-10 = 0 // : 1/16
z^-10 = 0
z należy do O
z belongs to the empty set
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