On the Superstability of the Pexider Type Trigonometric Functional Equation

نویسندگان

  • Gwang Hui Kim
  • Yeol Je Cho
چکیده

We will investigate the superstability of the hyperbolic trigonometric functional equation from the following functional equations: fx y ± gx − y λfxgy andfx y ± gx − y λgxfy, which can be considered the mixed functional equations of the sine function and cosine function, the hyperbolic sine function and hyperbolic cosine function, and the exponential functions, respectively.

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تاریخ انتشار 2010