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Secant Function
Math Trig Complex Class

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

"Secant"
Secant of a complex or real number.
Inverse of the ASec function.

Examples: 
    Secant(-0.5) = 1.13949392732455
    Secant(0) = 1
    Secant(0.5) = 1.13949392732455
    Secant(1) = 1.85081571768093
    Secant(1.5) = 14.1368329029699
    Secant(2) = -2.40299796172238
    Secant(2.5) = -1.24821565146882
    Secant(3) = -1.01010866590799
    Secant(3.5) = -1.06785504719181
    Secant("2.3|-4.5") = "-1.48055525157198E-02|-1.65664869105198E-02"
See also: 
    Sine Function
    Cotangent Function
    Cosecant function
    ASec Function
    SecH Function
    Sec Function
vX: Number whose 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 Sec within their Derived Math Function help topic.

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