In this paper, the authors introduce and establish the stability of single variable mixed quintic-sextic, septic-octic and nonic-decic functional equation of the form ϑ (2p) = 48ϑ (p) + 16ϑ (−p); η(2q) = 192η(q) + 64η(−q); ψ(2r) = 768ψ(r) + 256ψ(−r); in Banach space with the help of Ulam-Hyers and Radus methods.
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