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ACOS(3)		       FreeBSD 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	11.2			 July 31, 2008			  FreeBSD 11.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS

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