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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/h = 10/30 // - 10/30
5/h-(10/30) = 0
5/h-1/3 = 0
5*h^-1 = 1/3 // : 5
h^-1 = 1/15
-1 < 0
1/(h^1) = 1/15 // * h^1
1 = 1/15*h^1 // : 1/15
15 = h^1
h = 15
h = 15
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