Application of Gegenbauer polynomials for biunivalent functions defined by subordination

We present and investigate a new subclass of biunivalent functions by applying Gegenbouer polynomials in this paper. Also, we find nonsharp estimates on the first two coefficients b₀ and % b₁ for functions belonging to this subclass. Furthermore, the Fekete-Szegö inequality b₁-η b₀² for this subclass is obtained. We also point out some consequences of results.