WorksheetFunction.Acot (Excel)

Returns the arccotangent of a number, in radians in the range 0 (zero) to pi.

Acot (Arg1)

Arg1: The cotangent of the angle that you want.

Dim dblArg1 As Double: dblArg1 = 
Dim dblAcot As Double
dblAcot = WorksheetFunction.Acot(Arg1:=dblArg1)