NAME
    IEEEDPAcos -- compute the arc cosine of a number

SYNOPSIS
      x   = IEEEDPAcos(  y  );
    d0/d1              d0/d1

    double  x,y;

FUNCTION
    Compute arc cosine of y in IEEE double precision

INPUTS
    y - IEEE double precision floating point value

RESULT
    x - IEEE double precision floating point value

BUGS

SEE ALSO
    IEEEDPCos(), IEEEDPAtan(), IEEEDPAsin()