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RedHat 9 (Linux i386) - man page for acos (redhat section 3)

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

NAME
       acos - arc cosine function

SYNOPSIS
       #include <math.h>

       double acos(double x);

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
       SVID 3, POSIX, BSD 4.3, ISO 9899

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

					    1993-06-08					  ACOS(3)


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