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This article deals with the upper bound of fourth‐order Hankel and Toeplitz determinants for the convex functions which are defined by using the sine function. The main tools in this study are the coefficient inequalities for the class P of functions with positive real parts. Also, the investigation of the upper bound of the fourth‐order Hankel determinant for 3‐fold symmetric convex functions associated with the sine function is included.
Zulfiqar et al. (Sat,) studied this question.