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tan.3m (2010 09)

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tan(3M) tan(3M)
NAME
tan( ), tanf( ), tanl( ), tanw( ), tanq( ) - tangent functions
SYNOPSIS
#include <math.h>
double tan(double x);
float tanf(float x);
HP Integrity Server Only
long double tanl(long double x);
extended tanw(extended x);
quad tanq(quad x);
DESCRIPTION
tan() returns the tangent of x (x specified in radians).
On PA-RISC systems,
tan() may lose accuracy when x is far from zero.
tanf() is a float version of tan(); it takes a
float argument and returns a float result.
Integrity Server Only
tanl() is a long double version of tan(); it takes a long double argument and returns a
long double result.
tanw() is an extended version of tan(); it takes an extended argument and returns an
extended result.
tanq() is equivalent to tanl() on HP-UX systems.
USAGE
To use these functions, compile either with the default
-Ae option or with the
-Aa and the
-D_HPUX_SOURCE options.
To use (for Integrity servers)
tanw() or tanq(), 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
.
PA-RISC Only
Millicode versions of the
tan() and tanf() functions are available. Millicode versions of math library
functions are usually faster than their counterparts in the standard library. To use these versions, com-
pile your program with the +Olibcalls or the +Oaggressive optimization option.
For special cases, the millicode versions return the same values as their standard library counterparts
(see the RETURN VALUE section).
RETURN VALUE
tan(±0) returns ±0.
If x is ±INFINITY,
tan() returns NaN and raises the invalid exception.
x is NaN,
tan() returns NaN.
When it raises no other exception, whether
tan() raises the inexact exception is unspecified.
ERRORS
No errors are defined.
SEE ALSO
atan(3M), atan2(3M), cos(3M), ctan(3M), sin(3M), sincos(3M), tand(3M), tan(3M), math(5).
STANDARDS CONFORMANCE
tan(): SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ‘‘IEC 60559 floating-point arith-
metic’’)
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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