tan(3) - c6

1TAN(3)                     Linux Programmer's Manual                    TAN(3)
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NAME

6       tan, tanf, tanl - tangent function
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SYNOPSIS

9       #include <math.h>
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11       double tan(double x);
12       float tanf(float x);
13       long double tanl(long double x);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       tanf(), tanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
20       _ISOC99_SOURCE; or cc -std=c99
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DESCRIPTION

23       The tan() function returns the tangent of x, where x is given in  radi‐
24       ans.
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RETURN VALUE

27       On success, these functions return the tangent of x.
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29       If x is a NaN, a NaN is returned.
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31       If  x is positive infinity or negative infinity, a domain error occurs,
32       and a NaN is returned.
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34       If the correct result would overflow, a range  error  occurs,  and  the
35       functions  return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with
36       the mathematically correct sign.
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ERRORS

39       See math_error(7) for information on how to determine whether an  error
40       has occurred when calling these functions.
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42       The following errors can occur:
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44       Domain error: x is an infinity
45              An invalid floating-point exception (FE_INVALID) is raised.
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47       Range error: result overflow
48              An overflow floating-point exception (FE_OVERFLOW) is raised.
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50       These functions do not set errno.
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CONFORMING TO

53       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
54       4.3BSD, C89.
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COLOPHON

60       This page is part of release 3.22 of the Linux  man-pages  project.   A
61       description  of  the project, and information about reporting bugs, can
62       be found at http://www.kernel.org/doc/man-pages/.
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66                                  2008-08-05                            TAN(3)