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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/4 = 9/h // - 9/h
5/4-(9/h) = 0
5/4-9*h^-1 = 0
-9*h^-1 = -5/4 // : -9
h^-1 = 5/36
-1 < 0
1/(h^1) = 5/36 // * h^1
1 = 5/36*h^1 // : 5/36
36/5 = h^1
h = 36/5
h = 36/5
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