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

1 - Corresponding JSB Entry Point

      MTH$HACOS_R8

2 - Returns

    None.

3 - Arguments

 h-radians

    OpenVMS usage:floating_point
    type:         H_floating
    access:       write only
    mechanism:    by reference

    Angle (in radians) whose cosine is specified by cosine. The h-
    radians argument is the address of an H-floating number that
    is this angle. MTH$HACOS writes the address of the angle into
    h-radians.

 cosine

    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference

    The cosine of the angle whose value (in radians) is to be
    returned. The cosine argument is the address of a floating-point
    number that is this cosine. The absolute value of cosine must
    be less than or equal to 1. For MTH$HACOS, cosine specifies an
    H-floating number.