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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
4/h = 16/8 // - 16/8
4/h-(16/8) = 0
4/h-2 = 0
4*h^-1 = 2 // : 4
h^-1 = 1/2
-1 < 0
1/(h^1) = 1/2 // * h^1
1 = 1/2*h^1 // : 1/2
2 = h^1
h = 2
h = 2
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