VMS Help RTL Routines, MTH$, MTH$xACOS  *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 routine returns that angle (in radians).

    Format

      MTH$ACOS  cosine

      MTH$DACOS  cosine

      MTH$GACOS  cosine

      Each of the above formats accepts one of the floating-point
      types as input.

  Additional Information (explode) :

• Corresponding JSB Entry Points
• Returns
• Argument