Man Linux: Main Page and Category List

tan, tanf, tanl - tangent function

#include<math.h>doubletan(doublex);floattanf(floatx);longdoubletanl(longdoublex);Link with-lm. Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):tanf(),tanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; orcc-std=c99

Thetan() function returns the tangent ofx, wherexis given in radians.

On success, these functions return the tangent ofx. Ifxis a NaN, a NaN is returned. Ifxis 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 returnHUGE_VAL,HUGE_VALF, orHUGE_VALL, respectively, with the mathematically correct sign.

Seemath_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error:xis an infinity An invalid floating-point exception (FE_INVALID) is raised. Range error: result overflow An overflow floating-point exception (FE_OVERFLOW) is raised. These functions do not seterrno.

C99, POSIX.1-2001. The variant returningdoublealso conforms to SVr4, 4.3BSD, C89.

acos(3),asin(3),atan(3),atan2(3),cos(3),ctan(3),sin(3)

This page is part of release 3.24 of the Linuxman-pagesproject. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-08-05