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():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

25       These functions return the tangent of x, where x is given in radians.
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RETURN VALUE

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

40       See math_error(7) for information on how to determine whether an  error
41       has occurred when calling these functions.
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43       The following errors can occur:
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45       Domain error: x is an infinity
46              errno  is set to EDOM (but see BUGS).  An invalid floating-point
47              exception (FE_INVALID) is raised.
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49       Range error: result overflow
50              An overflow floating-point exception (FE_OVERFLOW) is raised.
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ATTRIBUTES

53       For  an  explanation  of  the  terms  used   in   this   section,   see
54       attributes(7).
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56       ┌──────────────────────┬───────────────┬─────────┐
57       │Interface             │ Attribute     │ Value   │
58       ├──────────────────────┼───────────────┼─────────┤
59       │tan(), tanf(), tanl() │ Thread safety │ MT-Safe │
60       └──────────────────────┴───────────────┴─────────┘

CONFORMING TO

62       C99, POSIX.1-2001, POSIX.1-2008.
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64       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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BUGS

67       Before version 2.10, the glibc implementation did not set errno to EDOM
68       when a domain error occurred.
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SEE ALSO

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

74       This page is part of release 4.16 of the Linux  man-pages  project.   A
75       description  of  the project, information about reporting bugs, and the
76       latest    version    of    this    page,    can     be     found     at
77       https://www.kernel.org/doc/man-pages/.
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81                                  2017-09-15                            TAN(3)
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