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Second Hankel determinant for Mocanu type bi-starlike functions related to shell-shaped region

Second Hankel determinant for Mocanu type bi-starlike functions related to shell-shaped region

In this paper, we investigate the coefficient bound estimates, second Hankel determinant, and Fekete-Szegö inequality for the analytic bi-univalent function class, which we call Mocanu type bi-starlike functions, related to a shell-shaped region in the open unit disk in the complex plane. Some interesting special cases of the results are …