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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)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO

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