ASIN (3)
arc sine function
SYNOPSIS
#include <math.h>
double asin(double x );
DESCRIPTION
The asin() function calculates the arc sine of x; that is
the value whose sine is x. If x falls outside the range
-1 to 1, asin() fails and errno is set.
RETURN VALUE
The asin() function returns the arc sine in radians and the
value is mathematically defined to be between -PI/2 and PI/2
(inclusive).
ERRORS
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
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