Geodesic
A Cosine Functional Equation with Restricted Argument
Canadian mathematical bulletin, Tome 17 (1974) no. 4, pp. 505-509

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We name a functional equation with restricted argument one in which at least one of the variables is restricted to a certain discrete subset of the domain of the other variable(s). In particular, the subset may consist of a single element.The purpose of this paper is to present a functional equation satisfied only by cosine functions. 
Etigson, L. B. A Cosine Functional Equation with Restricted Argument. Canadian mathematical bulletin, Tome 17 (1974) no. 4, pp. 505-509. doi: 10.4153/CMB-1974-089-x
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     title = {A {Cosine} {Functional} {Equation} with {Restricted} {Argument}},
     journal = {Canadian mathematical bulletin},
     pages = {505--509},
     year = {1974},
     volume = {17},
     number = {4},
     doi = {10.4153/CMB-1974-089-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-089-x/}
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