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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
10/h = 3 // - 3
10/h-3 = 0
10*h^-1 = 3 // : 10
h^-1 = 3/10
-1 < 0
1/(h^1) = 3/10 // * h^1
1 = 3/10*h^1 // : 3/10
10/3 = h^1
h = 10/3
h = 10/3
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