Man Acos en anglais
ACOS(3)                    Linux Programmer's Manual                   ACOS(3)



 

NAME


       acos, acosf, acosl - arc cosine function

 

SYNOPSIS


       #include 

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

       Link with -lm.

 

DESCRIPTION






       The  acos()  function calculates the arc cosine of x; that is the value
       whose cosine is x.  If x falls outside the range -1 to 1, acos()  fails
       and errno is set.

 

RETURN VALUE


       The  acos() function returns the arc cosine in radians and the value is
       mathematically defined to be between 0 and PI (inclusive).

 

ERRORS


       EDOM   x is out of range.

 

CONFORMING TO


       SVr4, POSIX.1-2001, 4.3BSD, C89, C99.  The float and long double  vari-
       ants are C99 requirements.

 

SEE ALSO


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

 

COLOPHON


       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



                                  2004-10-06                           ACOS(3)