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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
((-h)^2-(2*h)+2)/h = 0
((-h)^2-2*h+2)/h = 0
(h^2-2*h+2)/h = 0
h^2-2*h+2 = 0
h^2-2*h+2 = 0
DELTA = (-2)^2-(1*2*4)
DELTA = -4
DELTA < 0
1 = 0
1/h = 0
h belongs to the empty set
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