tanf (3) - Linux Man Pages
tanf: tangent function
tan, tanf, tanl - tangent function
#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 versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTIONThese functions return the tangent of x, where x is given in radians.
RETURN VALUEOn 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.
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.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|tan(), tanf(), tanl()||Thread safety||MT-Safe|
CONFORMING TOC99, POSIX.1-2001, POSIX.1-2008.
BUGSBefore version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred.
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