Superstability of Some Pexider-Type Functional Equation.

We will investigate the superstability of the sine functional equation from the following Pexidertype functional equation f(x+y)+g(x-y) = λ∙h(x)k(y) (λ : constant),which can be considered the mixed functional equation of the sine and cosine functions, the mixed functional equation of the hyperbolic sine and hyperbolic cosine functions, and the exponential-type functional equations. [ABSTRACT FROM AUTHOR]