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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
30/h-3 = 27 // - 27
30/h-27-3 = 0
30*h^-1 = 30 // : 30
h^-1 = 1
-1 < 0
1/(h^1) = 1 // * h^1
1 = 1*h^1 // : 1
1 = h^1
h = 1
h = 1
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