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D( z )
z^1 = 0
z^1 = 0
z^1 = 0
z = 0
z in (-oo:0) U (0:+oo)
((((3*z^1)/3)^2)/(z^1))/6 = 0
((((3*z)/3)^2)/z)/6 = 0
1/6*z = 0 // : 1/6
z = 0
z in { 0}
z belongs to the empty set
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