cosd.3m (2010 09)

c
cosd(3M) cosd(3M)
NAME
cosd( ), cosdf( ), cosdl( ), cosdw( ), cosdq( ) - cosine functions of an argument specified in degrees
SYNOPSIS
#include <math.h>
double cosd(double x);
float cosdf(float x);
HP Integrity Server Only
long double cosdl(long double x);
extended cosdw(extended x);
quad cosdq(quad x);
DESCRIPTION
cosd() returns the cosine of x (x specified in degrees).
On PA-RISC systems,
cosd() may lose accuracy when x is far from zero.
cosdf() is a float version of cosd(); it takes a
float argument and returns a float result.
Integrity Server Only
cosdl() is a long double version of cosd(); it takes a long double argument and returns a
long double result.
cosdw() is an extended version of cosd(); it takes an extended argument and returns an
extended result.
cosdq() is equivalent to cosdl() on HP-UX systems.
USAGE
To use these functions compile either with the default
-Ae option or with the
-Aa and
-D_HPUX_SOURCE options.
To use (for Integrity servers)
cosdw() or cosdq(), compile also with the -fpwidetypes option.
To use any of these functions, make sure your program includes
<math.h>, and link in the math library
by specifying -lm on the compiler or linker command line.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
cosd(±0) returns 1.
If x is ±INFINITY,
cosd() returns NaN and raises the invalid exception.
If x is NaN,
cosd() returns NaN.
ERRORS
No errors are defined.
SEE ALSO
acosd(3M), asind(3M), atand(3M), atan2d(3M), cos(3M), sincosd(3M), sind(3M), tand(3M), math(5).
STANDARDS CONFORMANCE
These functions are not specified by any standard.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1