An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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hyperbolic cosine
  کوسینوس ِ هذلولی  
kosinus-e hozluli
Fr.: cosinus hyperbolique  

A function, denoted cosh x, defined for all real values of x, by the relation: cosh x = (1/2) (ex + e-x).

See also: → hyperbolic; → cosine.