TY - JOUR TI - On some trigonometric functional inequalities AU - R. Badora AU - R. Ger JO - Functional Equations- Results and Advances PY - 2002 DA - 2002// VL - 12 ID - Badora2002 ER - TY - JOUR TI - The stability of the equation f(x+y) = f(x)f(y) AU - J. Baker AU - J. Lawrence AU - F. Zororzitto JO - Proc. Amer. Math. Soc. PY - 1979 DA - 1979// VL - 74 ID - Baker1979 ER - TY - JOUR TI - The stability of the cosine equation AU - J. A. Baker JO - Proc. Amer. Math. Soc. PY - 1980 DA - 1980// VL - 80 ID - Baker1980 ER - TY - JOUR TI - On Hyers-Ulam stability of the generalized Cauchy and Wilson equations AU - E. Elqorachie AU - M. Akkouchi JO - Publ. Math. Debrecen PY - 2005 DA - 2005// VL - 66 ID - Elqorachie2005 ER - TY - JOUR TI - On the stability of some functional equation AU - P. Gavruta JO - In: Stability of Mappings of Hyers- Ulam Type, Hardronic Press, Palm Harbor, FL, U.S.A. PY - 1994 DA - 1994// VL - ID - Gavruta1994 ER - TY - JOUR TI - On the stability of the linear functional equatinon AU - D. H. Hyers JO - Proc. Natl. Acad. Sci. USA. PY - 1941 DA - 1941// VL - 27 ID - Hyers1941 ER - TY - BOOK TI - Hyers-Ulam-Rassias Stability of Functional Equations in Nonlinear Analysis AU - S.-M. Jung PB - Series Springer Optimization and Its Applications PY - 2011 DA - 2011// CY - Springer ID - Jung2011 ER - TY - JOUR TI - The stability of the dAlembert and Jensen type functional equations AU - G. H. Kim JO - J. Math. Anal Appl. PY - 2007 DA - 2007// VL - 325 ID - Kim2007 ER - TY - BOOK TI - Superstability of approximate dAlembert AU - H. M. Kim AU - G. H. Kim AU - M. H. Han PB - Journal of Inequalities and Applications PY - 2011 DA - 2011// CY - ID - Kim2011 ER - TY - JOUR TI - The stability of a cosine functional equation AU - P. Nakmahschalasint JO - KMITL Sci J. PY - 2007 DA - 2007// VL - 1 ID - Nakmahschalasint2007 ER - TY - BOOK TI - Hyers-Ulam stability of the generalized trigonometric formulas, Article 74. AU - A. Redouani AU - E. Elqorachi AU - B. Bouikhalene PB - JI- PAM PY - 2006 DA - 2006// CY - ID - Redouani2006 ER - TY - BOOK TI - Problems in Modern Mathematics, Chap.VI AU - S. M. Ulam PB - Science editions, Wiley PY - 1964 DA - 1964// CY - New York ID - Ulam1964 ER -