cos(3) Library Functions Manual cos(3) cos, cosf, cosl - LIBRARY Math library (libm, -lm) #include double cos(double x); float cosf(float x); long double cosl(long double x); glibc (. feature_test_macros(7)): cosf(), cosl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE x, x . x. x NaN, NaN. x , , NaN. math_error(7), , . : : x errno EDOM ( . ). (FE_INVALID). attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |cos(), cosf(), cosl() | | MT-Safe | +----------------------------+----------------------------------------------------------+--------------------------+ C11, POSIX.1-2008. C89, POSIX.1-2001. , double, SVr4, 4.3BSD. Before glibc 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred. . acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3), tan(3) Azamat Hackimov , Dmitriy S. Seregin , Dmitry Bolkhovskikh , Katrin Kutepova , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . cos(3)