Nurlibaev Аманжол, and Bekzhigitova Ләззат. “Complex Progressions, Formulas for Their Sums and Applications”. Рroblems of engineering and professional education 2, no. 2 (December 12, 2022): 54. Accessed November 25, 2024. https://bulprengpe.enu.kz/index.php/main/article/view/107.