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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
8/h-(1/3) = 5/h // - 5/h
8/h-(5/h)-(1/3) = 0
8/h-5*h^-1-1/3 = 0
3*h^-1 = 1/3 // : 3
h^-1 = 1/9
-1 < 0
1/(h^1) = 1/9 // * h^1
1 = 1/9*h^1 // : 1/9
9 = h^1
h = 9
h = 9
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