|TAN(3)||Linux Programmer's Manual||TAN(3)|
NAMEtan, tanf, tanl - tangent function
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)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;or cc -std=c99
DESCRIPTIONThe tan() function returns the tangent of x, where x is given in radians.
RETURN VALUEOn success, these functions return the tangent of x.
ERRORSSee 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 TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
BUGSBefore version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred.
SEE ALSOacos(3), asin(3), atan(3), atan2(3), cos(3), ctan(3), sin(3)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.