Other approaches related to Huygens trigonometric inequalities. Letters in Nonlinear Analysis and its Applications, [S. l.], v. 1, n. 4, p. 191–202, 2023. DOI: 10.66147/lnaa.20231402. Disponível em: https://lettersinnonlinearanalysis.com/index.php/lnaa/article/view/v1n4a20. Acesso em: 13 jun. 2026.