ON THE SUPERSTABILITY OF THE GENERALIZED SINE FUNCTIONAL EQUATIONS
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Abstract
Inthispaper,westudythesuperstabilityproblembounded by two-variables of Th. M. Rassias type for the generalized sine func- tional equations
g(x + y)f(x − y) = f(x)^2 − f(y)^2
f(x + y)g(x − y) = f(x)^2 − f(y)^2
g(x + y)g(x − y) = f(x)^2 − f(y)^2,
which does not use his iteration method.
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