tand.3m (2010 09)

t
tand(3M) tand(3M)
NAME
tand( ), tandf( ), tandl( ), tandw( ), tandq( ) - tangent functions of an argument specified in degrees
SYNOPSIS
#include <math.h>
double tand(double x);
float tandf(float x);
HP Integrity Server Only
long double tandl(long double x);
extended tandw(extended x);
quad tandq(quad x);
DESCRIPTION
tand() returns the tangent of x (x specified in degrees).
On PA-RISC systems,
tand() may lose accuracy when x is far from zero.
tandf() is a float version of tand(); it takes a
float argument and returns a float result.
Integrity Server Only
tandl() is a long double version of tand(); it takes a long double argument and returns a
long double result.
tandw() is an extended version of tand(); it takes an extended argument and returns an
extended result.
tandq() is equivalent to tandl() 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)
tandw() or tandq(), 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
tand(±0) returns ±0.
If x is ±INFINITY,
tand() returns NaN and raises the invalid exception.
If x is NaN,
tand() returns NaN.
ERRORS
No errors are defined.
SEE ALSO
acosd(3M), asind(3M), atand(3M), atan2d(3M), cosd(3M), sincosd(3M), sind(3M), tan(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