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A Cos H Function
Math Trig Complex Class

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

"Inverse Hyperbolic Cosine"
Angle whose hyperbolic cosine is X.
Inverse of the CosH function.

Examples: 
    ACosH(-10) = 2.99322284612638
    ACosH(-2) = 1.31695789692482
    ACosH(-1) = 0
    ACosH(0) = "0|1.5707963267949"
    ACosH(-0.5) = "3.33066907387547E-16|1.0471975511966"
    ACosH(1) = 0
    ACosH(2) = 1.31695789692482
    ACosH(10) = 2.99322284612638
    ACosH("2.3|-4.5") = "2.1552640881525|-0.560507402681906"
See also: 
    ACos Function
    CosH Function
    ASinH Function
    ATanH Function
    ACscH Function
    HArccos Function
vX: Function returns the principal value of the angle whose hyperbolic cosine (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 HArccos within their Derived Math Function help topic.

Definition: 

    Logarithm(Absolute(X) + Sqrt((X - 1) * (X + 1)))

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