NAME
asin, asinf, asinl - arc sine function SYNOPSIS
#include
double asin(double x); float asinf(float x); long double asinl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): asinf(), asinl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 200112L;
or cc -std=c99 DESCRIPTION The asin() function calculates the principal value of the arc sine of x; that is the value whose sine is x. RETURN VALUE 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. ERRORS See matherror(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 (FEINVALID) is raised. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤
│asin(), asinf(), asinl() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘ CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89. SEE ALSO acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2010-09-20 ASIN(3)