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NetBSD 6.1.5 - man page for acos (netbsd section 3)

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ACOS(3) 			   BSD 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'').

BSD					   May 2, 1991					      BSD
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