**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"

**See also:** 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)

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