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ACOS(3)			    Library Functions Manual		       ACOS(3)

NAME
       acos, acosf, acosl -- arc cosine	functions

LIBRARY
       Math Library (libm, -lm)

SYNOPSIS
       #include	<math.h>

       double
       acos(double x);

       float
       acosf(float x);

       long double
       acosl(long double x);

DESCRIPTION
       The  acos(), acosf(), and acosl() functions compute the principal value
       of the arc cosine of x.

RETURN VALUES
       These functions return the arc cosine in	the  range  [0,	 pi]  radians.
       If:

	     |x| > 1,

       acos(x) raises an invalid exception and returns an NaN.

SEE ALSO
       asin(3),	 atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3),
       sinh(3),	tan(3),	tanh(3)

STANDARDS
       The acos(), acosf(), and	acosl()	functions conform to ISO/IEC 9899:1999
       ("ISO C99").

FreeBSD	14.3			 July 31, 2008			       ACOS(3)

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<https://man.freebsd.org/cgi/man.cgi?query=acosf&sektion=3&manpath=FreeBSD+14.3-RELEASE+and+Ports>

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