On the Superstability Related with the Trigonometric Functional Equation
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We will investigate the superstability of the (hyperbolic) trigonometric functional equation from the following functional equations: Open image in new window , Open image in new window , Open image in new window , Open image in new window , 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.
KeywordsDifferential Equation Partial Differential Equation Ordinary Differential Equation Functional Analysis Functional Equation
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