tan(3m) - osol9

1tan(3M)                 Mathematical Library Functions                 tan(3M)
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NAME

6       tan, tanf, tanl - tangent function
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SYNOPSIS

9       c99 [ flag... ] file... -lm [ library... ]
10       #include <math.h>
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12       double tan(double x);
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15       float tanf(float x);
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18       long double tanl(long double x);
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DESCRIPTION

22       These  functions  compute  the tangent of their argument x, measured in
23       radians.
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RETURN VALUES

26       Upon successful completion, these functions return the tangent of x.
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29       If x is NaN, a NaN is returned.
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32       If x is ±0, x is returned.
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35       If x is ±Inf, a domain error occurs and a NaN is returned.
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ERRORS

38       These functions will fail if:
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40       Domain Error    The value of x is ±Inf.
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42                       If   the   integer   expression   (math_errhandling   &
43                       MATH_ERREXCEPT) is non-zero, the invalid floating-point
44                       exception is raised.
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USAGE

48       There are no known floating-point representations such that for a  nor‐
49       mal argument, tan(x) is either overflow or underflow.
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52       An  application  wanting to check for exceptions should call feclearex‐
53       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
54       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
55       non-zero, an exception has been raised. An  application  should  either
56       examine the return value or check the floating point exception flags to
57       detect exceptions.
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ATTRIBUTES

60       See attributes(5) for descriptions of the following attributes:
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65       ┌─────────────────────────────┬─────────────────────────────┐
66       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
67       ├─────────────────────────────┼─────────────────────────────┤
68       │Interface Stability          │Standard                     │
69       ├─────────────────────────────┼─────────────────────────────┤
70       │MT-Level                     │MT-Safe                      │
71       └─────────────────────────────┴─────────────────────────────┘
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