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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
4/h = 12/5 // - 12/5
4/h-(12/5) = 0
4/h-12/5 = 0
4*h^-1 = 12/5 // : 4
h^-1 = 3/5
-1 < 0
1/(h^1) = 3/5 // * h^1
1 = 3/5*h^1 // : 3/5
5/3 = h^1
h = 5/3
h = 5/3
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