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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3/h = 12/24 // - 12/24
3/h-(12/24) = 0
3/h-1/2 = 0
3*h^-1 = 1/2 // : 3
h^-1 = 1/6
-1 < 0
1/(h^1) = 1/6 // * h^1
1 = 1/6*h^1 // : 1/6
6 = h^1
h = 6
h = 6
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