## Sec H FunctionMath Trig Complex Class

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

### "Hyperbolic Secant" Hyperbolic secant of a real or complex number. Inverse of the ASecH function.

Examples:
```    SecH(-2) = 0.26580222883408
SecH(-1) = 0.648054273663885
SecH(0) = 1
SecH(1) = 0.648054273663885
SecH(2) = 0.26580222883408
SecH(10) = 9.07998593378172E-05
SecH("2.3|-4.5") = "-4.34852891695235E-02|-0.197642049718895"```
```    Secant Function
SinH Function
CotH Function
CscH Function
ASecH Function
HSec Function```
vX: Number whose hyperbolic secant 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 HSec within their Derived Math Function help topic.

Definition:

`    2 / (Exponent(X) + Exponent(-X))`