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

  ASIN (real-number)

  A function that returns the arc sine 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   |  ASIN   | ASIN     | REAL*4     | REAL*4      |
  |      |         | DASIN    | REAL*8     | REAL*8      |
  |      |         | QASIN    | REAL*16    | REAL*16     |
  +------+---------+----------+------------+-------------+