asin(3) Library Functions Manual asin(3) asin, asinf, asinl - (libm -lm) #include double asin(double x); float asinf(float x); long double asinl(long double x); glibc ( feature_test_macros(7)): asinf(), asinl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE x x. x [-pi/2, pi/2]. x (NaN) NaN. x +0 (-0) +0 (-0). x [-1, 1] NaN. math_error(7) . : : x [-1, 1] errno EDOM. (FE_INVALID). attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |asin(), | | MT-Safe | |asinf(), | | | |asinl() | | | +------------+------------------------------------+--------------------+ C11, POSIX.1-2008. C99 POSIX.1-2001. double SVr4 4.3BSD C89. acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3) 3 . . : . 6.18 8 2026 asin(3)