asin (3) - Linux Man Pages
asin: arc sine function
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)):
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTIONThese functions calculate the principal value of the arc sine of x; that is the value whose sine is x.
RETURN VALUEOn 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.
ERRORSSee 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.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|asin(), asinf(), asinl()||Thread safety||MT-Safe|
CONFORMING TOC99, POSIX.1-2001, POSIX.1-2008.
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