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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3/8 = 6/h-2 // - 6/h-2
3/8-(6/h)+2 = 0
3/8-6*h^-1+2 = 0
-6*h^-1 = -19/8 // : -6
h^-1 = 19/48
-1 < 0
1/(h^1) = 19/48 // * h^1
1 = 19/48*h^1 // : 19/48
48/19 = h^1
h = 48/19
h = 48/19
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