Orhani S. Addressing Students’ Challenges in Acquiring Trigonometric Function Concepts: A Didactic Approach to Education for Sustainable Development. J. Educ. Sust. Dev. Stud. [Internet]. 2024 Dec. 23 [cited 2025 Feb. 22];1(2):160-72. Available from: https://spm-online.com/jesds/index.php/journal/article/view/15