COTD Cotangent Degrees Function
Section:  Mathematical Functions 
Usage
Computes the cotangent of the argument, but takes
the argument in degrees instead of radians (as is the case
for cot). The syntax for its use is
   y = cotd(x)
Examples
The cotangent of 45 degrees should be 1.
--> cotd(45)
ans = 
 1