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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(2*h^2-(4*h))/h = 0
(2*h^2-4*h)/h = 0
2*h^2-4*h = 0
2*h*(h-2) = 0
h-2 = 0 // + 2
h = 2
2*h*(h-2) = 0
(2*h*(h-2))/h = 0
( 2*h )
2*h = 0 // : 2
h = 0
( h-2 )
h-2 = 0 // + 2
h = 2
h in { 0}
h = 2
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