The Difficulties Encountered by Mathematics Teachers in Applying Modern Teaching Strategies in Secondary Schools. Humanities and Educational Sciences Journal, [S. l.], n. 51, p. 113–133, 2026. DOI: 10.55074/hesj.vi51.1656. Disponível em: https://hesj.org/ojs/index.php/hesj/article/view/1656. Acesso em: 4 jun. 2026.