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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(h*h*h*h*h*h*h*h)/h = 0
1*h^7 = 0 // : 1
h^7 = 0
h = 0
h in { 0}
h belongs to the empty set
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