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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
9/8 = 5/h // - 5/h
9/8-(5/h) = 0
9/8-5*h^-1 = 0
-5*h^-1 = -9/8 // : -5
h^-1 = 9/40
-1 < 0
1/(h^1) = 9/40 // * h^1
1 = 9/40*h^1 // : 9/40
40/9 = h^1
h = 40/9
h = 40/9
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