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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(9/2)/(5/2) = 8/h // - 8/h
(9/2)/(5/2)-(8/h) = 0
(9/2)/(5/2)-8*h^-1 = 0
-8*h^-1 = -9/5 // : -8
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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