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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/h = 8 // - 8
5/h-8 = 0
5*h^-1 = 8 // : 5
h^-1 = 8/5
-1 < 0
1/(h^1) = 8/5 // * h^1
1 = 8/5*h^1 // : 8/5
5/8 = h^1
h = 5/8
h = 5/8
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