An Etymological Dictionary of Astronomy and Astrophysics

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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) (e^x + e^-x).

An Etymological Dictionary of Astronomy and Astrophysics
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