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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
48/9 = 72/h // - 72/h
48/9-(72/h) = 0
48/9-72*h^-1 = 0
-72*h^-1 = -16/3 // : -72
h^-1 = 2/27
-1 < 0
1/(h^1) = 2/27 // * h^1
1 = 2/27*h^1 // : 2/27
27/2 = h^1
h = 27/2
h = 27/2
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