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A Sec Function
Math Trig Complex Class

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

"Inverse Secant" or "Arcsecant"
Angle whose secant is X.
Inverse of the Secant function.

Examples: 
    ASec(-0.5) = "3.1415926535898|-1.31695789692482"
    IsNull(ASec(0)) = True
    ASec(0.5) = "-3.5527136788005E-15|1.31695789692482"
    ASec(1) = -3.5527136788005E-15
    ASec(1.5) = 0.84106867056793
    ASec(2) = 1.0471975511966
    ASec(3) = 1.23095941734077
    ASec(10) = 1.47062890563334
    ASec("2.3|-4.5") = "1.4820015760061|-0.175981348644681"
See also: 
    Secant Function
    ASin Function
    ACot Function
    ACsc Function
    ASecH Function
    Arcsec Function
vX: Function returns the principal value of the angle whose 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 Arcsec within their Derived Math Function help topic.

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