(1) Department of Mathematics, Faculty of Sciences and Arts, Valahia University of Targovişte, 130082 Targovişte, Romania
Abstract:
We prove in this paper that for every x ≥ 0,
where and α = 1.072042464..., then
where and β = 0.988503589... Besides the simplicity, our new formulas are very accurate, if we take into account that they are much stronger
than Burnside’s formula, which is considered one of the best approximation formulas ever known having a simple form.