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.
STANDARDS CONFORMANCE
These functions are not specified by any standard.
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