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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
15.2/h = 3.8/3 // - 3.8/3
15.2/h-(3.8/3) = 0
15.2/h-1.26666667 = 0
15.2*h^-1 = 1.26666667 // : 15.2
h^-1 = 0.08333333
-1 < 0
1/(h^1) = 0.08333333 // * h^1
1 = 0.08333333*h^1 // : 0.08333333
12.00000048 = h^1
h = 12.00000048
h = 12.00000048
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