The authors in have recently introduced a new generalised derivatives operator μn,m λ1,λ2, which generalised many well-known operators studied earlier by many different authors. By making use of the generalised derivative operator μn,m λ1,λ2, the authors derive the class of function denoted by Hn,m λ1,λ2, which contain normalised analytic univalent functions f defined on the open unit disc U={z ∈(The symbol is abbreviated):|z|<1} and satisfy Re(μn,m λ1,λ2 f(z))'>0, (z ∈ U). This paper focuses on attaining sharp upper bound for the functional |a2a4−a23| for functions f (z)= (The equation is abbreviated) belonging to the class Hn,m λ1,λ2.
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