Nargiza Vaxobjonovna , Tojiboyeva. “TRIGONOMETRIK AYNIYATLAR VA ULARNING ISBOTLARI”. Scientific Impulse 1, no. 5 (January 1, 2023): 446–451. Accessed April 8, 2025. http://nauchniyimpuls.ru/index.php/ni/article/view/2858.