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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
8/h = 21/14 // - 21/14
8/h-(21/14) = 0
8/h-3/2 = 0
8*h^-1 = 3/2 // : 8
h^-1 = 3/16
-1 < 0
1/(h^1) = 3/16 // * h^1
1 = 3/16*h^1 // : 3/16
16/3 = h^1
h = 16/3
h = 16/3
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