Volume 6, Issue 3 Yun Hua Refinements and sharpness of some new Huygens type inequalities 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 Yun Hua Find more articles with the same keywords refinement sharpening Huygens inequality Wilker inequality trigonometric function hyperbolic functions Find more articles with the same subject classes 26D05 33B10