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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(((h+81)^1)/2-((81^1)/2))/h = 0
((h+81)/2-81/2)/h = 0
(h+81)/2-81/2 = 0
h-81+81 = 0
h = 0
h/2 = 0
h/2 = 0 // * 2
h = 0
h/h = 0
h = 0
h in { 0}
h belongs to the empty set
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