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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
10/h = 52/13 // - 52/13
10/h-(52/13) = 0
10/h-4 = 0
10*h^-1 = 4 // : 10
h^-1 = 2/5
-1 < 0
1/(h^1) = 2/5 // * h^1
1 = 2/5*h^1 // : 2/5
5/2 = h^1
h = 5/2
h = 5/2
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