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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
12/h = 3/11 // - 3/11
12/h-(3/11) = 0
12/h-3/11 = 0
12*h^-1 = 3/11 // : 12
h^-1 = 1/44
-1 < 0
1/(h^1) = 1/44 // * h^1
1 = 1/44*h^1 // : 1/44
44 = h^1
h = 44
h = 44
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