ACOS(3)                 NetBSD Library Functions Manual                ACOS(3)


NAME
acos, acosf -- arc cosine function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double acos(double x); float acosf(float x);
DESCRIPTION
The acos() and acosf() functions compute the principal value of the arc cosine of x in the range [0, pi].
RETURN VALUES
If |x|>1, acos(x) and acosf(x) set the global variable errno to EDOM.
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 ANSI X3.159-1989 (``ANSI C89''). NetBSD 5.0 May 2, 1991 NetBSD 5.0

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