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NAME    [Toc]    [Back]

       acos - arc cosine function

SYNOPSIS    [Toc]    [Back]

       #include <math.h>

       double acos(double x);

DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

       EDOM   x is out of range.

CONFORMING TO    [Toc]    [Back]

       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO    [Toc]    [Back]

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

				  1993-06-08			       ACOS(3)
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