Functional Approach in Teaching and Learning Plane Trigonometry. International Journal of Scientific Research and Management (IJSRM), [S. l.], v. 6, n. 06, p. EL–2018, 2018. DOI: 10.18535/ijsrm/v6i6.el013. Disponível em: https://ijsrm.net/index.php/ijsrm/article/view/1568.. Acesso em: 6 may. 2024.