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Erf C Function
Math Engineering Class

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

Compute the complementary error function.

Examples: 
    ErfC(-5.0) = 1.99999999999846
    ErfC(-1.0) = 1.84270079294971
    ErfC(-0.5) = 1.52049987781305
    ErfC(+0.0) = 1
    ErfC(+0.5) = 0.479500122186953
    ErfC(+1.0) = 0.157299207050285
    ErfC(+5.0) = 1.53745979442803E-12
    ErfC(+5.0) = 1 - Erf(+5.0)
See also: 
    Erf Function
    DERFC 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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