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ACOS(3) 	       FreeBSD 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 C89'').

FreeBSD 4.9			  May 2, 1991			   FreeBSD 4.9