|TAN(3)||Linux Programmer's Manual||TAN(3)|
NAME¶tan, tanf, tanl - tangent function
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)):
DESCRIPTION¶These functions return the tangent of x, where x is given in radians.
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.
ATTRIBUTES¶For an explanation of the terms used in this section, see attributes(7).
|tan (), tanf (), tanl ()||Thread safety||MT-Safe|
CONFORMING TO¶C99, POSIX.1-2001, POSIX.1-2008.
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.
SEE ALSO¶acos(3), asin(3), atan(3), atan2(3), cos(3), ctan(3), sin(3)
COLOPHON¶This page is part of release 5.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.