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