Section 11,19: COS

 COS (number)

 A function that returns the cosine of the argument.  The argument
 must be in radians; it is treated modulo 2*pi.

 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |   1  |  COS    | COS      | REAL*4     | REAL*4      |
 |      |         | DCOS     | REAL*8     | REAL*8      |
 |      |see note | QCOS     | REAL*16    | REAL*16     |
 |      |         | CCOS     | COMPLEX*8  | COMPLEX*8   |
 |      |         | CDCOS    | COMPLEX*16 | COMPLEX*16  |
 |      |         | ZCOS     | COMPLEX*16 | COMPLEX*16  |
 +------+---------+----------+------------+-------------+

 NOTE: QCOS is not available in DEC Fortran.