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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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)
-.\"
-.TH tan 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-tan, tanf, tanl \- tangent function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double tan(double " x );
-.BI "float tanf(float " x );
-.BI "long double tanl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR tanf (),
-.BR tanl ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return the tangent of
-.IR x ,
-where
-.I x
-is
-given in radians.
-.SH RETURN VALUE
-On success, these functions return the tangent of
-.IR x .
-.P
-If
-.I x
-is a NaN, a NaN is returned.
-.P
-If
-.I x
-is positive infinity or negative infinity,
-a domain error occurs,
-and a NaN is returned.
-.P
-If the correct result would overflow,
-a range error occurs,
-and the functions return
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-or
-.BR HUGE_VALL ,
-respectively, with the mathematically correct sign.
-.\" 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 ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Domain error: \fIx\fP is an infinity
-.I errno
-is set to
-.B EDOM
-(but see BUGS).
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.TP
-Range error: result overflow
-.\" 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 .
-An overflow floating-point exception
-.RB ( FE_OVERFLOW )
-is raised.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR tan (),
-.BR tanf (),
-.BR tanl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH BUGS
-Before glibc 2.10, the glibc implementation did not set
-.\" http://sourceware.org/bugzilla/show_bug.cgi?id=6782
-.I errno
-to
-.B EDOM
-when a domain error occurred.
-.SH SEE ALSO
-.BR acos (3),
-.BR asin (3),
-.BR atan (3),
-.BR atan2 (3),
-.BR cos (3),
-.BR ctan (3),
-.BR sin (3)