DocumentationMathematicaBuilt-in FunctionsMathematical FunctionsElementary Functions
Cosh
Cosh[z] gives the hyperbolic cosine of z.
Mathematical function (see Section A.3.10). . See Section 3.2.6. See also: ArcCosh, Sech, TrigToExp, TrigExpand. New in Version 1.
Further Examples
Cosh[z] gives the hyperbolic cosine of z. 
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