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



NAME
       acos, acosf, acosl - arc cosine function

SYNOPSIS
       #include <&lt;math.h>&gt;

       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)