Abstract
Motivated by the works of H.M. Srivastava et al. [7], we introduce and investigate two new general subclasses HT (?,?,?), h,pHT (?) of bi-starlike and bi-convex of Ma-Minda type functions. Bounds on the first two coefficients |a2| and |a3| for functions in HT (?,?,?), h,pHT (?) are given. The results here generalize and improve the corresponding earlier works done by Ali et al.[1] and Brannan et al.[2].
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