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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
36 = 10/h // - 10/h
36-(10/h) = 0
36-10*h^-1 = 0
-10*h^-1 = -36 // : -10
h^-1 = 18/5
-1 < 0
1/(h^1) = 18/5 // * h^1
1 = 18/5*h^1 // : 18/5
5/18 = h^1
h = 5/18
h = 5/18
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