asin, asinf, asinl - arc sine function
#include <math.h> double asin(double x); float asinf(float x); long double asinl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): asinf(), asinl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions calculate the principal value of the arc sine of x; that is the value whose sine is x.
On success, these functions return the principal value of the arc sine of x in radians; the return value is in the range [-pi/2, pi/2]. If x is a NaN, a NaN is returned. If x is +0 (-0), +0 (-0) is returned. If x is outside the range [-1, 1], 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: x is outside the range [-1, 1] errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤ │asin(), asinf(), asinl() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘
C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.
acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)
This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2016-03-15 ASIN(3)
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