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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
6/16 = 3/h // - 3/h
6/16-(3/h) = 0
6/16-3*h^-1 = 0
-3*h^-1 = -3/8 // : -3
h^-1 = 1/8
-1 < 0
1/(h^1) = 1/8 // * h^1
1 = 1/8*h^1 // : 1/8
8 = h^1
h = 8
h = 8
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