PROOF WITHOUT WORDS: SINE DIFFERENCE IDENTITY. Far East Journal of Mathematical Education, [S. l.], v. 26, n. 2, p. 123–124, 2024. DOI: 10.17654/0973563124013. Disponível em: https://pphmjopenaccess.com/fejme/article/view/2329. Acesso em: 5 jan. 2026.