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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/12 = 4/h // - 4/h
5/12-(4/h) = 0
5/12-4*h^-1 = 0
-4*h^-1 = -5/12 // : -4
h^-1 = 5/48
-1 < 0
1/(h^1) = 5/48 // * h^1
1 = 5/48*h^1 // : 5/48
48/5 = h^1
h = 48/5
h = 48/5
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