NGUYỄN, Thị Bảo Uyên; TRAN, Van Su. Evaluating trigonometric systems in triangles without using area factors. Dong Thap University Journal of Science, [S. l.], v. 13, n. 2, p. 108–115, 2024. DOI: 10.52714/dthu.13.2.2024.1240. Disponível em: https://dthujs.vn/index.php/dthujs/article/view/1500. Acesso em: 11 may. 2024.