Kunrattanaworawong J, Sintunavarat W. On the general solution and stability of the functional equation \(f (x-y) - f(x) f(y) = dsinxsiny\). Modern Math. Methods [Internet]. 2025 Aug. 20 [cited 2025 Aug. 30];3(2):85-91. Available from: https://modernmathmeth.com/index.php/pub/article/view/67