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Sec H Function
Math Trig Complex Class

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

"Hyperbolic Secant"
Hyperbolic secant of a real or complex number.
Inverse of the ASecH function.

Examples: 
    SecH(-2) = 0.26580222883408
    SecH(-1) = 0.648054273663885
    SecH(0) = 1
    SecH(1) = 0.648054273663885
    SecH(2) = 0.26580222883408
    SecH(10) = 9.07998593378172E-05
    SecH("2.3|-4.5") = "-4.34852891695235E-02|-0.197642049718895"
See also: 
    Secant Function
    SinH Function
    CotH Function
    CscH Function
    ASecH Function
    HSec Function
vX: Number whose hyperbolic secant 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 HSec within their Derived Math Function help topic.

Definition: 

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

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