On the Superstability Related with the Trigonometric Functional Equation
Advances in Difference Equations volume 2009, Article number: 503724 (2009)
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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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