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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
2/h-2+1 = h/h+2 // - h/h+2
2/h-(h/h)-2-2+1 = 0
2/h-2-2-1+1 = 0
2*h^-1 = 4 // : 2
h^-1 = 2
-1 < 0
1/(h^1) = 2 // * h^1
1 = 2*h^1 // : 2
1/2 = h^1
h = 1/2
h = 1/2
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