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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/9 = h/h-8 // - h/h-8
5/9-(h/h)+8 = 0
5/9-1+8 = 0
68/9 = 0
h belongs to the empty set
h belongs to the empty set
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