Abstract
For a∈(0,1/2] and r∈(0,1), let Ka(r) and Ea(r) (K(r) and E(r)) denote the generalized elliptic integrals (the complete elliptic integrals, respectively) of the first and second kinds, respectively. In this paper, the authors present the necessary and sufficient conditions under which certain familiar combinations defined in terms of the generalized elliptic integrals and elementary functions are monotone in a∈(0,1/2]. By these results, sharp bounds expressed in terms of K(r), E(r) and elementary functions are obtained for Ka(r) and Ea(r), thus showing the dependence on the parameter a of Ka(r) and Ea(r), and substantially improving the known related results.
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