asinf man page on OpenBSD

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```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.

acos(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
```
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