VMS Help RTL Routines, MTH$, MTH$HACOS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Given the cosine of an angle, the Arc Cosine of Angle Expressed
    in Radians (H-Floating Value) routine returns that angle (in
    radians) in H-floating-point precision.

    Format

      MTH$HACOS  h-radians ,cosine

  Additional Information (explode) :

• Corresponding JSB Entry Point
• Returns
• Arguments