G’ofurova Dilfuzaxon. “MATEMATIKA DARSIDA TRIGONOMETRIK IFODALARNI AYNIY ALMASHTIRISH MAVZUSINING DOLZARBLIGI”. World scientific research journal 10, no. 2 (December 20, 2022): 110–112. Accessed May 16, 2024. http://wsrjournal.com/index.php/wsrj/article/view/2376.