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A Sec H Function
Math Trig Complex Class

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

"Inverse Hyperbolic Secant"
Angle whose hyperbolic secant is X.
Inverse of the SecH function.

Examples: 
    ASecH(-10) = "1.49011580830027E-10|1.47062890415069"
    ASecH(-2) = "1.22124532708767E-15|1.0471975511966"
    ASecH(-1) = 0
    ASecH(-0.5) = 1.31695789692482
    IsNull(ASecH(0)) = True
    ASecH(0.5) = 1.31695789692482
    ASecH(1) = 0
    ASecH(2) = "1.22124532708767E-15|1.0471975511966"
    ASecH(10) = "1.49011580830027E-10|1.47062890415069"
    ASecH("2.3|-4.5") = "3.32630134369553E-02|1.36272428148542"
See also: 
    ASec Function
    SecH Function
    ASinH Function
    ACotH Function
    ACscH Function
    HArcsec Function
vX: Function returns the principal value of the angle whose hyperbolic secant (expressed in radians) is vX. 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.
Note: Microsoft named this function HArcsec within their Derived Math Function help topic.

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