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   cosf    ( 3 )

функция косинуса (cosine function)

Имя (Name)

cos, cosf, cosl - cosine function

Синопсис (Synopsis)

#include <math.h>

double cos(double x); float cosf(float x); long double cosl(long double x);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

cosf(), cosl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE


Описание (Description)

These functions return the cosine of x, where x is given in
       radians.

Возвращаемое значение (Return value)

On success, these functions return the cosine 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 returned.


Ошибки (Error)

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.


Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface Attribute Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │cos(), cosf(), cosl() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘


Стандарты (Conforming to)

C99, POSIX.1-2001, POSIX.1-2008.

The variant returning double also conforms to SVr4, 4.3BSD.


Ошибки (баги) (Bugs)

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

Смотри также (See also)

acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3),
       tan(3)