VMS Help RTL Routines, MTH$, MTH$xACOSD  *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 Degrees routine returns that angle (in degrees).

    Format

      MTH$ACOSD  cosine

      MTH$DACOSD  cosine

      MTH$GACOSD  cosine

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

1 - Corresponding JSB Entry Points

      MTH$ACOSD_R4

      MTH$DACOSD_R7

      MTH$GACOSD_R7

      Each of the above JSB entry points accepts one of the floating-
      point types as input.

2 - Returns

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_floating
    access:       write only
    mechanism:    by value

    Angle in degrees. MTH$ACOSD returns an F-floating number.
    MTH$DACOSD returns a D-floating number. MTH$GACOSD returns a
    G-floating number.

3 - Argument

 cosine

    OpenVMS usage:floating_point
    type:         F_floating, G_floating, D_floating
    access:       read only
    mechanism:    by reference

    Cosine of the angle whose value (in degrees) 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$ACOSD, cosine specifies an F-floating
    number. For MTH$DACOSD, cosine specifies a D-floating number. For
    MTH$GACOSD, cosine specifies a G-floating number.