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Bessel J1 Function
Math Engineering Class

Public Function BesselJ1( _
    ByVal vX As Variant _
    ) As Variant

Compute the Bessel function of the first kind of order one.

Examples: 
    BesselJ1(-.5) = -0.242268457674874
    BesselJ1(0.0) = 0
    BesselJ1(0.5) = -0.242268457674874
    BesselJ1(5.0) = -0.327579137591465
    BesselJ1(5.0) = BesselJ(5.0, 1)
See also: 
    BesselJ0 Function
    BesselJ Function
    BesselY1 Function
    DBESJ1 Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

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