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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
8/48 = 4/h // - 4/h
8/48-(4/h) = 0
8/48-4*h^-1 = 0
-4*h^-1 = -1/6 // : -4
h^-1 = 1/24
-1 < 0
1/(h^1) = 1/24 // * h^1
1 = 1/24*h^1 // : 1/24
24 = h^1
h = 24
h = 24
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