Copyright © 2010 Jeongwook Chang and Jaeyoung Chung. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
We consider the Hyers-Ulam stability of a class of trigonometric functional equations
in the spaces of generalized functions such as Schwartz distributions, Fourier hyperfunctions, and Gelfand generalized functions.