2025-08-12https://repository.covenantuniversity.edu.ng/handle/123456789/49881We derive existence results for the periodic boundary value problem .r'" ' + uf.· + f (.); ).\: + ex + g (f. r(..r - r) = p ( l ) \ ( OJ = x(2rrl .. ~ (0) = .\· (2 17' ) . . \' Ol = x! '21r ). :\'' (0) i ' : \ ' (2 7r) using degree theoretic methods. The uniqueness of periodic solutions is also examinedapplication/pdfQA MathematicsOn The Existence Of Periodic Solutions Of Certain Fourth Order Differential Equations with DealyArticle