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ACOS(3)			 BSD Library Functions Manual		       ACOS(3)

NAME
     acos, acosf -- arc	cosine functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     acos(double x);

     float
     acosf(float x);

DESCRIPTION
     The acos()	and the	acosf()	functions compute the principal	value of the
     arc cosine	of x.  A domain	error occurs for arguments not in the range
     [-1, +1].	For a discussion of error due to roundoff, see math(3).

RETURN VALUES
     The acos()	and the	acosf()	functions return the arc cosine	in the range
     [0, pi] radians.  On the VAX and Tahoe, if:

	   |x| > 1,

     acos(x) sets the global variable errno to EDOM and	a reserved operand
     fault is generated.

SEE ALSO
     asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
     tan(3), tanh(3)

STANDARDS
     The acos()	function conforms to ISO/IEC 9899:1990 ("ISO C90").

BSD				  May 2, 1991				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS

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