SHINDE, Rupali; CHESNEAU, Christophe; DARKUNDE, Nitin. Solutions of two open problems on inequalities involving trigonometric and hyperbolic functions. CUBO, A Mathematical Journal, [S. l.], v. 26, n. 3, p. 431–442, 2024. DOI: 10.56754/0719-0646.2603.431. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/3828. Acesso em: 11 oct. 2025.