MAZĖTIS, Edmundas; MELNIČENKO, Grigorijus. A rational cotangents of the angles of a triangle. Lietuvos matematikos rinkinys, [S. l.], v. 55, n. B, p. 84–89, 2014. DOI: 10.15388/LMR.B.2014.16. Disponível em: https://journals.vu.lt./LMR/article/view/17214.. Acesso em: 21 nov. 2024.