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