
Abstract In this paper we prove the Hyers–Ulam–Rassias stability of the equations f ( x + y ) - g ( x ) - h ( y ) = 0 , f ( x + y ) + g ( x - y ) - 2 h ( x ) - 2 k ( y ) = 0 , f ( xy ) + g ( x + y ) - h ( xy + x ) - k ( y ) = 0 .
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