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BIE Function
Math Engineering Class

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

Calculate the Bairy function for a negative argument and an exponentially scaled Bairy function for a non-negative argument.

Examples: 
    BIE(-5.0) = -0.138369134901601
    BIE(-0.5) = 0.380352659751054
    BIE(+0.0) = 0.614926627446001
    BIE(+0.5) = 0.67489241111563
    BIE(+5.0) = 0.381108531088877
See also: 
    BI Function
    AIE Function
    DBIE Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

BIE(X) calculates the double precision Airy function of the second kind or the double precision exponentially scaled Airy function of the second kind, depending on the value of the double precision argument X.
Evaluate BI(X) for X <= 0 and BI(X)*EXP(-ZETA) where ZETA = 2/3 * X^(3/2) for X >= 0

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