THE STABILITY OF A COSINE-SINE FUNCTIONAL EQUATION ON ABELIAN GROUPS

Ajebbar Omar, Elqorachi Elhoucien, Themistocles M. Rassias

Abstract


In this paper we establish the stability of the functional equation

f(x − y) = f(x)g(y) + g(x)f(y) + h(x)h(y),  x, y ∈ G,

where G is an abelian group.


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ISSN: 1229-1595 (Print), 2466-0973 (Online)