Library /sys$common/syshlp/helplib.hlb  —  FORTRAN  Intrinsic Procedures, ACOS
  ACOS (real-number)

  Class:  Elemental function - Generic

  Returns the arc cosine of the argument in radians.  The absolute
  value of the argument must be less than or equal to 1.

  +------+---------+----------+------------+-------------+
  | Args | Generic | Specific |  Argument  | Result Type |
  +------+---------+----------+------------+-------------+
  |  1   | ACOS    | ACOS     | REAL*4     | REAL*4      |
  |      |         | DACOS    | REAL*8     | REAL*8      |
  |      |         | QACOS    | REAL*16    | REAL*16     |
  +------+---------+----------+------------+-------------+
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