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Cos H Function
Math Trig Complex Class

Public Function CosH( _
    ByVal vX As Variant _
    ) As Variant

"Hyperbolic Cosine"
Hyperbolic cosine of a real or complex number.
Inverse of the ACosH function.

Examples: 
    CosH(-1) = 1.54308063481524
    CosH(-0.5) = 1.12762596520638
    CosH(0) = 1
    CosH(0.5) = 1.12762596520638
    CosH(1) = 1.54308063481524
    CosH(10) = 11013.2329201033
    CosH("2.3|-4.5") = "-1.06182495367184|4.82602885468343"
See also: 
    Cosine Function
    SinH Function
    TanH Function
    CscH Function
    ACosH Function
    HCos Function
vX: Number whose hyperbolic cosine is returned. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function). Complex numbers are represented within strings as "R|I" where R is the real part and I is the imaginary part.
Return: The result is expressed in radians.
Note: Microsoft named this function HCos within their Derived Math Function help topic.

Definition: 

    (Exponent(X) + Exponent(-X)) / 2

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