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COS(P)			   POSIX Programmer's Manual			COS(P)

NAME
       cos, cosf, cosl - cosine function

SYNOPSIS
       #include <math.h>

       double cos(double x);
       float cosf(float x);
       long double cosl(long double x);

DESCRIPTION
       These  functions shall compute the cosine of their argument x, measured
       in radians.

       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
       occurred.

RETURN VALUE
       Upon successful completion, these functions shall return the cosine  of
       x.

       If x is NaN, a NaN shall be returned.

       If x is ±0, the value 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.

ERRORS
       These functions shall fail if:

       Domain Error
	      The x argument 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.

EXAMPLES
   Taking the Cosine of a 45-Degree Angle
	      #include <math.h>
	      ...
	      double radians = 45 * M_PI / 180;
	      double result;
	      ...
	      result = cos(radians);

APPLICATION USAGE
       These  functions	 may  lose accuracy when their argument is near an odd
       multiple of pi/2 or is far from 0.

       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.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       acos() , feclearexcept() , fetestexcept() , isnan() , sin() ,  tan()  ,
       the  Base  Definitions  volume  of  IEEE Std 1003.1-2001, Section 4.18,
       Treatment of Error Conditions for Mathematical Functions, <math.h>

COPYRIGHT
       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 http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003				COS(P)
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