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ACOS(3)                             Linux Programmer's Manual                             ACOS(3)

       acos, acosf, acosl - arc cosine function

       #include <math.h>

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

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       acosf(), acosl():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
           _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

       The acos() function calculates the arc cosine of x; that is the value whose cosine is x.

       On success, these functions return the arc cosine of x in radians; the return value is  in
       the range [0, pi].

       If x is a NaN, a NaN is returned.

       If x is +1, +0 is returned.

       If  x  is  positive  infinity  or  negative  infinity, a domain error occurs, and a NaN is

       If x is outside the range [-1, 1], a domain error occurs, and a NaN is returned.

       See math_error(7) for information on how to determine whether an error has  occurred  when
       calling these functions.

       The following errors can occur:

       Domain error: x is outside the range [-1, 1]
              errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

       asin(3), atan(3), atan2(3), cacos(3), cos(3), sin(3), tan(3)

       This  page  is  part of release 3.74 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of  this  page,  can  be
       found at http://www.kernel.org/doc/man-pages/.

                                            2010-09-20                                    ACOS(3)

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