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D( z )
(24*z^11)/(2*z^2) = 0
2*z^2 = 0
(24*z^11)/(2*z^2) = 0
(24*z^11)/(2*z^2) = 0
12*z^9 = 0 // : 12
z^9 = 0
z = 0
2*z^2 = 0
2*z^2 = 0
2*z^2 = 0 // : 2
z^2 = 0
z = 0
z in (-oo:0) U (0:+oo)
((24*z^11)/(2*z^2))^-3 = 0
1/1728*z^-27 = 0 // : 1/1728
z^-27 = 0
z należy do O
z belongs to the empty set
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