## A Cot H FunctionMath 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"```
```    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`