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D( h )
h-1 = 0
h = 0
h-1 = 0
h-1 = 0
h-1 = 0 // + 1
h = 1
h = 0
h = 0
h in (-oo:0) U (0:1) U (1:+oo)
((2*h-3)/(h-1)-1)/h = 0
(2*h-3)/(h-1)-1 = 0
(2*h-3)/(h-1)+(-1*(h-1))/(h-1) = 0
2*h-1*(h-1)-3 = 0
h-2 = 0
(h-2)/(h-1) = 0
(h-2)/(h-1) = 0 // * h-1
h-2 = 0
(h-2)/h = 0
h-2 = 0 // + 2
h = 2
h = 2
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