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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON |
TAN(3) Linux Programmer's Manual TAN(3)
tan, tanf, tanl - tangent function
#include <math.h>
double tan(double x);
float tanf(float x);
long double tanl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
tanf(), tanl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the tangent of x, where x is given in radians.
On success, these functions return the tangent of x.
If x is a NaN, a NaN is returned.
If x is positive infinity or negative infinity, a domain error
occurs, and a NaN is returned.
If the correct result would overflow, a range error occurs, and the
functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively,
with the mathematically correct sign.
See math_error(7) for information on how to determine whether an
error has occurred when calling these functions.
The following errors can occur:
Domain error: x is an infinity
errno is set to EDOM (but see BUGS). An invalid floating-
point exception (FE_INVALID) is raised.
Range error: result overflow
An overflow floating-point exception (FE_OVERFLOW) is raised.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────┼───────────────┼─────────┤
│tan(), tanf(), tanl() │ Thread safety │ MT-Safe │
└──────────────────────┴───────────────┴─────────┘
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
Before version 2.10, the glibc implementation did not set errno to
EDOM when a domain error occurred.
acos(3), asin(3), atan(3), atan2(3), cos(3), ctan(3), sin(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2016-03-15 TAN(3)
Pages that refer to this page: acos(3), asin(3), atan2(3), atan(3), cos(3), sin(3), sincos(3)