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 acosl()                 Calculate Long Double ArcCosine

 #include    <math.h>
 #include    <errno.h>

  long double acosl(x);
 long double x

    This is the long double-precision version of acos(); it returns
    the long double arccosine of x. See acos() for more
    information.

    Returns:            The arccosine result, or 0 if x is greater than 1
                        or less than -1.

 Portability:   Not supported by the ANSI standard.