Mazėtis, Edmundas, and Grigorijus Melničenko. “Algebraic Values of Sines and Cosines and Their Arguments”. Lietuvos matematikos rinkinys 61, no. B (March 15, 2021): 21–28. Accessed July 17, 2024. https://www.journals.vu.lt/LMR/article/view/22717.