부산대학교 도서관

The aim of this paper is to study a new and unified class RαCosh of analytic functions associated with cosine hyperbolic function in the open unit disc E = {z ∈ C : |z| < 1}. Some interesting properties of this class such as initial coefficient bounds, Fekete-Szego inequality, second Hankel determinant, Zalcman inequality and third Hankel determinant have been established. Furthermore, these results have also been studied for two-fold and three-fold symmetric functions.