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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
10/h = 5/6 // - 5/6
10/h-(5/6) = 0
10/h-5/6 = 0
10*h^-1 = 5/6 // : 10
h^-1 = 1/12
-1 < 0
1/(h^1) = 1/12 // * h^1
1 = 1/12*h^1 // : 1/12
12 = h^1
h = 12
h = 12
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