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Tan H Function
Math Trig Complex Class

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

"Hyperbolic Tangent"
Hyperbolic tangent of a real or complex number.
Inverse of the ATanH function.

Examples: 
    TanH(-1) = -0.761594155955765
    TanH(-0.5) = -0.46211715726001
    TanH(0) = 0
    TanH(0.5) = 0.46211715726001
    TanH(1) = 0.761594155955765
    TanH(2) = 0.964027580075817
    TanH(3) = 0.995054753686731
    TanH(10) = 0.999999995877693
    TanH("2.3|-4.5") = "1.01845109016774|-8.43881632319449E-03"
See also: 
    Tangent Function
    SinH Function
    CosH Function
    ATanH Function
    HTan Function
vX: Number whose hyperbolic tangent is returned. 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.
Return: The result is expressed in radians.
Note: Microsoft named this function HTan within their Derived Math Function help topic.

Definition: 

    Exponent(X) - Exponent(-X)
    --------------------------
    Exponent(X) + Exponent(-X)

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