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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);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       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,π] 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 a NaN 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 ±Inf.

		   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 POSIX.1‐2008, Section 4.19, Treatment of
       Error Conditions for Mathematical Functions, <math.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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 .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐ .

IEEE/The Open Group		     2013			      ACOS(3P)

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