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## NAME

tan,tanf,tanl -tangent functionSYNOPSIS

#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 (seefeature_test_macros(7)):tanf(),tanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; orcc -std=c99## DESCRIPTION

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

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.## ERRORS

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 infinityerrnois set toEDOM(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 TO

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

Before version 2.10, the glibc implementation did not seterrnotoEDOMwhen 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 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)

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