TAN(3) - man page online | library functions

Tangent function.

TAN(3)                              Linux Programmer's Manual                              TAN(3)

NAME tan, 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
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). ┌──────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────┼───────────────┼─────────┤ │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 4.04 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
2015-04-19 TAN(3)
This manual Reference Other manuals
tan(3) referred by acos(3) | asin(3) | atan(3) | atan2(3) | cos(3) | sin(3) | sincos(3)
refer to acos(3) | asin(3) | atan(3) | atan2(3) | attributes(7) | cos(3) | ctan(3) | feature_test_macros(7) | math_error(7) | sin(3)