/sys$common/syshlp/helplib.hlb FORTRAN, Intrinsic Procedures, COS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  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      |
  |      |         | QCOS     | REAL*16    | REAL*16     |
  |      |         | CCOS     | COMPLEX*8  | COMPLEX*8   |
  |      |         | CDCOS    | COMPLEX*16 | COMPLEX*16  |
  |      |         | ZCOS     | COMPLEX*16 | COMPLEX*16  |
  +------+---------+----------+------------+-------------+