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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" Japanese Version Copyright (c) 1996 Kenji Kajiwara and Kentaro Ogawa
.\" all rights reserved.
.\" Translated Sat, 13 Jul 1996 17:42:24 JST
.\" by Kenji Kajiwara and Kentaro Ogawa
.\" Proof Reading: Takashi Yoshino
.\" Updated 2008-09-16, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH TAN 3 2008-08-05 "" "Linux Programmer's Manual"
.SH ̾
tan, tanf, tanl \- ܡʥȡ˴ؿ
.SH
.nf
.B #include <math.h>
.sp
.BI "double tan(double " x );
.br
.BI "float tanf(float " x );
.br
.BI "long double tanl(long double " x );
.fi
.sp
\fI\-lm\fP ǥ롣
.sp
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.ad l
.BR tanf (),
.BR tanl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.ad b
.SH
.BR tan ()
ؿ \fIx\fP ܡʥȡˤ֤ͤ
\fIx\fP ϥ饸ñ̤ǻꤹ롣
.SH ֤
ȡδؿ
.I x
() ֤
.I x
NaN ξ硢NaN ֤롣
.I x
̵礫̵ξ硢
ΰ襨顼 (domain error) ȯNaN ֤롣
̤Сե硢ϰϥ顼 (range error) ȯ
ƴؿϤ줾
.BR HUGE_VAL ,
.BR HUGE_VALF ,
.B HUGE_VALL
֤
.\" I think overflow can't occur, because the closest floating-point
.\" representation of pi/2 is still not close enough to pi/2 to
.\" produce a large enough value to overflow.
.\" Testing certainly seems to bear this out. -- mtk, Jul 08
.\"
.\" POSIX.1 allows an optional underflow error;
.\" glibc 2.8 doesn't do this
.\" POSIX.1 an optional range error for subnormal x;
.\" glibc 2.8 doesn't do this
.SH 顼
δؿƤӽФݤ˥顼ȯȽˡˤĤƤξ
.BR math_error (7)
ȤΤȡ
.PP
ʲΥ顼ȯǽ롣
.TP
ΰ襨顼 (domain error): \fIx\fP ̵Ǥ
.\" .I errno
.\" is set to
.\" .BR EDOM .
(invalid) ư㳰
.RB ( FE_INVALID )
夬롣
.TP
ϰϥ顼 (range error): ̤ΥСե
.\" Unable to test this case, since the best approximation of
.\" pi/2 in double precision only yields a tan() value of 1.633e16.
.\" .I errno
.\" is set to
.\" .BR ERANGE .
Сեư㳰
.RB ( FE_OVERFLOW )
夬롣
.PP
δؿ
.I errno
ꤷʤ
.\" FIXME . Is it intentional that these functions do not set
.\" errno (at least for domain error)?
.\" Bug raised: http://sourceware.org/bugzilla/show_bug.cgi?id=6782
.SH
C99, POSIX.1-2001.
.I double
Ǥδؿ SVr4, 4.3BSD, C89 ˤƤ롣
.SH Ϣ
.BR acos (3),
.BR asin (3),
.BR atan (3),
.BR atan2 (3),
.BR cos (3),
.BR ctan (3),
.BR sin (3)
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