Adhikari , Tara Nath, and Abatar Subedi. “Difficulties of Grade X Students in Learning Trigonometry”. Siddhajyoti Interdisciplinary Journal 2, no. 01 (August 21, 2021): 90–99. Accessed September 18, 2024. https://nepjol.info/index.php/sij/article/view/39243.