Section (3) cos
cos, cosf, cosl — cosine function
||long double x
On success, these functions return the cosine of
x is a NaN, a
NaN is returned.
x is positive
infinity or negative infinity, a domain error occurs, and a
NaN is returned.
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:
xis an infinity
errnois set to EDOM (but see BUGS). An invalid floating-point exception (
FE_INVALID) is raised.
For an explanation of the terms used in this section, see attributes(7).
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD.
Before version 2.10, the glibc implementation did not set
errno to EDOM when a domain error occurred.
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Linux libc source code
Lewine_zsingle_quotesz_s _POSIX Programmer_zsingle_quotesz_s Guide_ (O_zsingle_quotesz_Reilly & Associates, 1991)
386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2002-07-27 by Walter Harms