SOME HYPERBOLIC SINE-COSINE TYPE FUNCTIONAL EQUATIONS

  • Charinthip Hengkrawit
  • Vichian Laohakosol
  • Patanee Udomkavanich
  • Janyarak Tongsomporn
Keywords: trigonometric sine-cosine functional equations, hyperbolic sine-cosine functional equations

Abstract

Using a technique of Kannapan from 2003, four functional equations, resemble certain well-known hyperbolic sine-cosine identities and generalizing the classical d’Alembert functional equation, are solved and interrelations among the solution functions are investigated

Published
2020-02-27