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Advances in Continuous and Discrete Models

Theory and Modern Applications

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On the Superstability Related with the Trigonometric Functional Equation

Advances in Difference Equations volume 2009, Article number: 503724 (2009) Cite this article

Abstract

We will investigate the superstability of the (hyperbolic) trigonometric functional equation from the following functional equations: , , , , which can be considered the mixed functional equations of the sine function and cosine function, of the hyperbolic sine function and hyperbolic cosine function, and of the exponential functions, respectively.

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  1. Department of Mathematics, Kangnam University, Youngin, Gyeonggi, 446-702, South Korea

    Gwang Hui Kim

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  1. Gwang Hui Kim
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Correspondence to Gwang Hui Kim.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kim, G.H. On the Superstability Related with the Trigonometric Functional Equation. Adv Differ Equ 2009, 503724 (2009). https://doi.org/10.1155/2009/503724

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  • DOI: https://doi.org/10.1155/2009/503724

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