Related Functions:
The COT function return the cotangent of an angle specified in radians.
 This function was introduced in Excel 2013 and so is not available in earlier versions.
Syntax
=COT(number)
Arguments
Argument  Description  

number  The angle, in radians, for which you want the cotangent

Examples
A  B  C  

1  Formula  Result  Notes 
2  =COT(30)  0.156  Returns the cotangent of 30 
3  =COT(A6)  0.617  Returns the cotangent of 45 
4  =COT(RADIANS(45))  1  Returns the cotangent of 45 degrees 
5  
6  45 
Note: If the angle is in degrees, you need to be convert it to radians before supplying it to the COT function. You can convert it, using the RADIANS function: =RADIANS(degrees)
Common Function Error(s)
Problem  What went wrong 

#VALUE!  Occurs if the supplied number argument is equal to zero 
#NUM!  Occurs if the supplied number argument is less than 2^27 or is greater than 2^27 
#DIV/0!  Occurs if the supplied number argument is not recognized as a numeric value 
The cotangent is the reciprocal of the tangent. For the simple rightangle triangle at with, the cotangent of the angle A is equal to the adjacent side (b), divided by the opposite side (a). The formula for calculating cotangent is:
See Wikipedia for more information on Trigonometric Ratios