NAMEtan, tanf, tanl - tangent function
SYNOPSIS#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)): tanf(), tanl(): _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. 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.
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 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. 2010-09-11 TAN(3)