ASIN(3) OpenBSD Programmer's Manual ASIN(3)NAME
asin, asinf, asinl - arc sine functions
SYNOPSIS
#include <math.h>
double
asin(double x);
float
asinf(float x);
long double
asinl(long double x);
DESCRIPTION
The asin() function computes the principal value of the arc sine of x in
the range [-pi/2, +pi/2]. The asinf() function is a single precision
version of asin(). The asinl() function is an extended precision version
of asin().
RETURN VALUES
If |x|>1, asin(x), asinf(x) and asinl(x) return NaN and set the global
variable errno to EDOM.
SEE ALSOacos(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
tan(3), tanh(3)OpenBSD 4.9 December 12, 2008 OpenBSD 4.9