Volume 7, Issue 4 Zhen-Hang Yang Refinements of a two-sided inequality for trigonometric functions Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Zhen-Hang Yang Find more articles with the same keywords Adamović-Mitrinović's inequality Cusa's inequality trigonometric functions sharp bound refinement Find more articles with the same subject classes 26D05 26A48 26D15 33B10