acos man page on OpenBSD

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ACOS(3)			  OpenBSD Programmer's Manual		       ACOS(3)

NAME
     acos, acosf, acosl - arc cosine functions

SYNOPSIS
     #include <math.h>

     double
     acos(double x);

     float
     acosf(float x);

     long double
     acosl(long double x);

DESCRIPTION
     The acos() function computes the principal value of the arc cosine of x
     in the range [0, pi].  The acosf() is a single precision version of
     acos().  The acosl() is an extended precision version of acos().

RETURN VALUES
     If |x|>1, acos(x), acosf(x) and acosl(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)

OpenBSD 4.9		       December 12, 2008		   OpenBSD 4.9
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