cos(3) — Linux manual page

cos(3)                  Library Functions Manual                  cos(3)

NAME         top

       cos, cosf, cosl - cosine function

LIBRARY         top

       Math library (libm, -lm)

SYNOPSIS         top

       #include <math.h>

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

   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

DESCRIPTION         top

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

RETURN VALUE         top

       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.

ERRORS         top

       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.

ATTRIBUTES         top

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

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

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       C89, POSIX.1-2001.

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

BUGS         top

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

SEE ALSO         top

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

Linux man-pages 6.04           2023-03-30                         cos(3)

Pages that refer to this page: acos(3),  asin(3),  atan2(3),  atan(3),  dlopen(3),  sin(3),  sincos(3),  tan(3)

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