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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3/h = 0.762 // - 0.762
3/h-0.762 = 0
3*h^-1 = 0.762 // : 3
h^-1 = 0.254
-1 < 0
1/(h^1) = 0.254 // * h^1
1 = 0.254*h^1 // : 0.254
3.93700787 = h^1
h = 3.93700787
h = 3.93700787
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