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