Stability of a Generalized Trigonometric-Quadratic Functional Equation

• Janyarak Tongsomporn,
• Vichian Laohakosol

Affiliations

Janyarak Tongsomporn

School of Science, Walailak University, Nakhon Si Thammarat 80160, Thailand

Vichian Laohakosol

Department of Mathematics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand