**Public Function Cotangent( _
ByVal vX As Variant _
) As Variant**

**"Cotangent" **

Cotangent of a complex or real number.

Inverse of the ACot function.

**Examples:** Cotangent(-0.5) = -1.83048772171245
IsNull(Cotangent(0)) = True
Cotangent(0.5) = 1.83048772171245
Cotangent(1) = 0.642092615934331
Cotangent(1.5) = 7.09148443026524E-02
Cotangent(2) = -0.457657554360286
Cotangent(2.5) = -1.33864812830415
Cotangent(3) = -7.01525255143453
Cotangent(3.5) = 2.66961648496887
Cotangent("2.3|-4.5") = "-2.45255631397247E-04|0.999972288864796"

**See also:** Tangent Function
Secant Function
Cosecant Function
ATan Function
TanH Function
Cotan Function

**vX:** Number whose 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 Cotan within their Derived Math Function help topic. Copyright 1996-1999 Entisoft

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