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A Tan H Function
Math Trig Complex Class

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

"Inverse Hyperbolic Tangent"
Angle whose hyperbolic tangent is X.
Inverse of the TanH function.

    ATanH(-10) = "-0.100335351042444|1.5707963267949"
    ATanH(-2) = "-0.549306129432895|1.5707963267949"
    IsNull(ATanH(-1)) = True
    ATanH(-0.5) = -0.549306144334055
    ATanH(0) = 0
    ATanH(0.5) = 0.549306144334055
    IsNull(ATanH(1)) = True
    ATanH(2) = "0.549306144334055|1.5707963267949"
    ATanH(10) = "0.100335342312472|1.5707963267949"
    ATanH("2.3|-4.5") = "0.087545427889694|-1.39503801025295"
See also:
    ATan Function
    TanH Function
    ASinH Function
    ACosH Function
    HArctan Function
vX: Function returns the principal value of the angle whose hyperbolic tangent (expressed in radians) is vX. 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.
Note: Microsoft named this function HArctan within their Derived Math Function help topic.


    Logarithm(- (X + 1) / (X - 1)) / 2

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