A note on the paper "Tang et al. [Bull Iran Math Soc (2019) doi:10.1007/s41980-019-00262-y]"

Abstract

Very recently Tang et al. [Bull Iran Math Soc (2019) doi:10.1007/s41980-019-00262-y] have studied some majorization results for two certain subclasses of the starlike functions associated with the sine and cosine functions defined by ${\mathcal{S}}_s^{\ast }$ and ${\mathcal{S}}_c^{\ast }$, respectively. In this note we pointed out that the definition of the class ${\mathcal{S}}_c^{\ast }$ and it's result are incorrect and give correct definition and result.

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