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  Include:   <math.h>, <errno.h>
 
  Syntax:    long double acosl( long double x );
             long double asinl( long double x );
             long double atanl( long double x );
             long double atan2l( long double y, long double x );
 
  Returns:   (acosl) the arccosine result, or 0 if x is greater than 1
                     or less than -1.
             (asinl) the arcsine result, or 0 if x is greater than 1 or
                     less than -1.
             (atanl) the arctangent result.
             (atan2l) the arctangent result, or 0 if both arguments
                      are 0.
             errno: EDOM
 
  See also:  cos, cosl, matherr, _matherrl, sin, sinl, tan, tanl
                                    -♦-