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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
-2 = 2/h-5 // - 2/h-5
5-(2/h)-2 = 0
5-2*h^-1-2 = 0
-2*h^-1 = -3 // : -2
h^-1 = 3/2
-1 < 0
1/(h^1) = 3/2 // * h^1
1 = 3/2*h^1 // : 3/2
2/3 = h^1
h = 2/3
h = 2/3
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