Volume 10, Issue 2 Zhen-Hang Yang Yuming Chu A Sharp double inequality involving trigonometric functions and its applications 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 Yuming Chu Find more articles with the same keywords Jordan inequality Oppenheim's double inequality sine integral Catalan constant Schwab-Borchardt Find more articles with the same subject classes 26D05 26E60