COT()
COT() — Returns the cotangent of an angle specified in radians.
Synopsis
COT(  {numeric-expression}  ) 
Description
The COT() function returns the cotangent of a specified angle as a FLOAT value. The angle must be specified in radians
    as a numeric expression.
Examples
The following example returns the secant, cosecant, and cotangent of angles from 0 to 90 degrees (where the angle is
    specified in radians).