acos man page on 4.4BSD

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

NAME
acos — arc cosine function

SYNOPSIS
#include <math.h>

double
acos(double x);

DESCRIPTION
The acos() function computes 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() function returns the arc cosine in the range [0, π] 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
sin(3), cos(3), tan(3), asin(3), atan(3), atan2(3), sinh(3), cosh(3),
tanh(3), math(3),

STANDARDS
The acos() function conforms to ANSI X3.159-1989 (“ANSI C89”).

BSD				 June 4, 1993				   BSD
```
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