#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)):
_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).
|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)
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acos(3), asin(3), atan(3), atan2(3), cos(3), sin(3), sincos(3).
The man pages tanf(3) and tanl(3) are aliases of tan(3).