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A Cot H Function
Math Trig Complex Class

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

"Inverse Hyperbolic Cotangent"
Angle whose hyperbolic cotangent is X.
Inverse of the CotH function.

Examples: 
    ACotH(-10) = -0.100335351042445
    ACotH(-2) = -0.549306129432894
    IsNull(ACotH(-1)) = True
    ACotH(-0.5) = "-0.549306144334055|1.5707963267949"
    ACotH(0) = "0|1.5707963267949"
    ACotH(0.5) = "0.549306144334055|1.5707963267949"
    IsNull(ACotH(1)) = True
    ACotH(2) = 0.549306144334055
    ACotH(10) = 0.100335342312471
    ACotH("2.3|-4.5") = "0.087545427889694|0.175758316541943"
See also: 
    ATan Function
    TanH Function
    ATanH Function
    ASecH Function
    ACscH Function
    HArccotan Function
vX: Function returns the principal value of the angle whose hyperbolic cotangent (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 HArccotan within their Derived Math Function help topic.

Definition: 

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

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