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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
9/1 = 8/h // - 8/h
9/1-(8/h) = 0
9-8*h^-1 = 0
-8*h^-1 = -9 // : -8
h^-1 = 9/8
-1 < 0
1/(h^1) = 9/8 // * h^1
1 = 9/8*h^1 // : 9/8
8/9 = h^1
h = 8/9
h = 8/9
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