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.

1 - Corresponding JSB Entry Points

      MTH$ACOS_R4

      MTH$DACOS_R7

      MTH$GACOS_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 radians. MTH$ACOS returns an F-floating number.
    MTH$DACOS returns a D-floating number. MTH$GACOS returns a G-
    floating number.

3 - Argument

 cosine

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_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$ACOS, cosine specifies an
    F-floating number. For MTH$DACOS, cosine specifies a D-floating
    number. For MTH$GACOS, cosine specifies a G-floating number.