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Bessel J0 Function
Math Engineering Class

Public Function BesselJ0( _
    ByVal vX As Variant _
    ) As Variant

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

Examples: 
    BesselJ0(-.5) = 0.938469807240812
    BesselJ0(0.0) = 1
    BesselJ0(0.5) = 0.938469807240812
    BesselJ0(5.0) = -0.177596771314338
    BesselJ0(5.0) = BesselJ(5.0, 0)
See also: 
    BesselJ1 Function
    BesselJ Function
    BesselY0 Function
    DBESJ0 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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