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