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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