tan, tanf, tanl - tangent function
Math library (libm
, -lm
)
#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)):
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:
x
is an infinityerrno
is set to EDOM (but see BUGS). An
invalid floating-point exception (FE_INVALID) is
raised.
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 |
Thread safety | MT-Safe |
C11, POSIX.1-2008.
C99, POSIX.1-2001.
The variant returning double
also conforms to SVr4, 4.3BSD,
C89.
Before glibc 2.10, the glibc implementation did not set
errno
to EDOM when a domain error
occurred.