go to> acos(3)> asin(3)> atan(3)> atan2(3)> cos(3)
Homepage > Man Pages > Category > Subroutines
Homepage > Man Pages > Name > T

# tanl

## man page of tanl

### tanl: tangent function

```NAME
tan, tanf, tanl - tangent function

SYNOPSIS
#include <math.h>

double tan(double x);
float tanf(float x);
long double tanl(long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

tanf(), tanl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
The tan() function returns the tangent  of  x,  where  x  is  given  in

RETURN VALUE
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.

ERRORS
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.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
4.3BSD, C89.

BUGS
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)

COLOPHON
This page is part of release 3.27 of the Linux  man-pages  project.   A
description  of  the project, and information about reporting bugs, can
be found at //www.kernel.org/doc/man-pages/.

2010-09-11                           TANL(3)
```