


      ACOS(3F)                    (UNIX 5.0)                   ACOS(3F)



      NAME
           acos, dacos - Fortran arccosine intrinsic function

      SYNTAX
           real r1, r2
           double precision dp1, dp2

           r2 = acos(r1)

           dp2 = dacos(dp1)
           dp2 = acos(dp1)

      DESCRIPTION
           Acos returns the arccosine of its argument, in real or
           double-precision that matches its argument.

           Dacos returns the double-precision arccosine of its double-
           precision argument.

           Although Acos works for either data type, dacos is for
           clarity in programming.

      SEE ALSO
           trig(3M).































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