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);
tanf(),
tanl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 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.
Before glibc 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)