COS Function Details
 
Syntax
  COS(numeric-expression)
 
The expression, numeric-expression, can be any numeric type.
 
By default, the cosine is calculated in single precision. If numeric-
expression is a double-precision value, the cosine is calculated in
double precision.
 
You can convert an angle measurement from degrees to radians by
multiplying the degrees by PI/180, where PI = 3.141593.
 
To convert a radian value to degrees, multiply it by 57.2958.