cos(3m) - osol9

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

6       cos, cosf, cosl - cosine function
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SYNOPSIS

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

22       These functions compute the cosine of x, measured in radians.
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RETURN VALUES

25       Upon successful completion, these functions return the cosine of x.
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28       If x is NaN, NaN is returned.
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31       If x is +0, 1.0 is returned.
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34       If x is ±Inf, a domain error occurs and a NaN is returned.
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ERRORS

37       These functions will fail if:
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39       Domain Error    The x argument is ±Inf.
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41                       If   the   integer   expression   (math_errhandling   &
42                       MATH_ERREXCEPT) is non-zero, the invalid floating-point
43                       exception is raised.
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USAGE

47       An  application  wanting to check for exceptions should call feclearex‐
48       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
49       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
50       non-zero, an exception has been raised. An  application  should  either
51       examine the return value or check the floating point exception flags to
52       detect exceptions.
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ATTRIBUTES

55       See attributes(5) for descriptions of the following attributes:
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60       ┌─────────────────────────────┬─────────────────────────────┐
61       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
62       ├─────────────────────────────┼─────────────────────────────┤
63       │Interface Stability          │Standard                     │
64       ├─────────────────────────────┼─────────────────────────────┤
65       │MT-Level                     │MT-Safe                      │
66       └─────────────────────────────┴─────────────────────────────┘
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