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D( z )
(2*z)^4 = 0
(2*z)^4 = 0
(2*z)^4 = 0
16*z^4 = 0 // : 16
z^4 = 0
z = 0
z in (-oo:0) U (0:+oo)
(2*z^4)/((2*z)^4) = 0
1/8 = 0
z belongs to the empty set
z belongs to the empty set
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