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ACOS(3P)		   POSIX Programmer's Manual		      ACOS(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       acos, acosf, acosl - arc cosine functions

       #include <math.h>

       double acos(double x);
       float acosf(float x);
       long double acosl(long double x);

       These functions shall compute the principal value of the arc cosine  of
       their argument x. The value of x should be in the range [-1,1].

       An  application	wishing to check for error situations should set errno
       to zero and  call  feclearexcept(FE_ALL_EXCEPT)	before	calling	 these
       functions.   On return, if errno is non-zero or fetestexcept(FE_INVALID
       | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error  has

       Upon successful completion, these functions shall return the arc cosine
       of x, in the range [0,pi] radians.

       For finite values of x not in the range [-1,1], a  domain  error	 shall
       occur,  and   either a NaN (if supported), or an implementation-defined
       value shall be returned.

       If x is NaN, a NaN shall be returned.

       If x is +1, +0 shall be returned.

       If x is ±Inf, a domain error shall occur, and either  a	NaN  (if  sup‐
       ported), or an implementation-defined value shall be returned.

       These functions shall fail if:

       Domain Error
	      The  x argument is finite and is not in the range [-1,1],	 or is

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then   errno  shall  be	set  to	 [EDOM].  If  the  integer  expression
       (math_errhandling &  MATH_ERREXCEPT)  is	 non-zero,  then  the  invalid
       floating-point exception shall be raised.

       The following sections are informative.


       On   error,   the   expressions	(math_errhandling  &  MATH_ERRNO)  and
       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
       at least one of them must be non-zero.



       cos(),  feclearexcept(),	 fetestexcept(), isnan(), the Base Definitions
       volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Condi‐
       tions for Mathematical Functions, <math.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at .

IEEE/The Open Group		     2003			      ACOS(3P)

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