ФЕДАК, Іван Васильович. SOME SUBSTANDARD APPLICATIONS OF THE COSINES THEOREM. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, [S. l.], n. 1(9), p. 51–55, 2019. Disponível em: https://pvntsh.nung.edu.ua/index.php/number/article/view/285. Acesso em: 6 dec. 2025.