## Cot H FunctionMath Trig Complex Class

```Public Function CotH( _
ByVal vX As Variant _
) As Variant```

### "Hyperbolic Cotangent" Hyperbolic cotangent of a real or complex number. Inverse of the ACotH function.

Examples:
```    CotH(-2) = -1.03731472072755
CotH(-1) = -1.31303528549933
IsNull(CotH(0)) = True
CotH(1) = 1.31303528549933
CotH(2) = 1.03731472072755
CotH(10) = 1.00000000412231
CotH("2.3|-4.5") = "0.981815776624225|8.13525861195918E-03"```
```    Tangent Function
TanH Function
SecH Function
CscH Function
ATanH Function
HCotan Function```
vX: Number whose hyperbolic cotangent 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 HCotan within their Derived Math Function help topic.

Definition:

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