Федак, І. В. (2019) “SOME SUBSTANDARD APPLICATIONS OF THE COSINES THEOREM”, PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, (1(9), pp. 51–55. Available at: https://pvntsh.nung.edu.ua/index.php/number/article/view/285 (Accessed: 6 December 2025).