@grogror Because the numerator in your expression should be x^4 - (x - epsilon)^4.
@grogror But either expression that I gave is valid, both will give the same answer. One uses the interval [x - e, x] and the other [x, x+e]
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@grogror But either expression that I gave is valid, both will give the same answer. One uses the interval [x - e, x] and the other [x, x+e]