TAN(3) Linux Programmer's Manual TAN(3)
tan, tanf, tanl - tangent function
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)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
The tan() function returns the tangent of x, where x is given in radians.
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
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.
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.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
Before version 2.10, the glibc implementation did not set errno to EDOM when a domain
acos(3), asin(3), atan(3), atan2(3), cos(3), ctan(3), sin(3)
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