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D( z )
(12*z)^3 = 0
(12*z)^3 = 0
(12*z)^3 = 0
1728*z^3 = 0 // : 1728
z^3 = 0
z = 0
z in (-oo:0) U (0:+oo)
((3*z)^5)/((12*z)^3) = 0
9/64*z^2 = 0 // : 9/64
z^2 = 0
z = 0
z in { 0}
z belongs to the empty set
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