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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
10 = 8/h // - 8/h
10-(8/h) = 0
10-8*h^-1 = 0
-8*h^-1 = -10 // : -8
h^-1 = 5/4
-1 < 0
1/(h^1) = 5/4 // * h^1
1 = 5/4*h^1 // : 5/4
4/5 = h^1
h = 4/5
h = 4/5
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