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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
4/h+2/h+1+2 = 0
6*h^-1 = -3 // : 6
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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