Section 11,9: ASIN

 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      |
 |      |see note | QASIN    | REAL*16    | REAL*16     |
 +------+---------+----------+------------+-------------+

 NOTE: QASIN is not available in DEC Fortran.