Umam, Ahmad Khairul, and Ahmad Isro’il. “BEBERAPA RUMUS TRIGONOMETRI MENGGUNAKAN PENDEKATAN GEOMETRI”. Prosiding Seminar Nasional Matematika dan Sains 5, no. 1 (February 2, 2024): 166-171. Accessed April 21, 2024. https://prosiding.biounwir.ac.id/article/view/253.