asin - arc sine function
double asin(double x);
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.
The asin() function returns the arc sine in radians and the value is
mathematically defined to be between -PI/2 and PI/2 (inclusive).
EDOM x is out of range.
SVID 3, POSIX, BSD 4.3, ISO 9899
acos(3), atan(3), atan2(3), cos(3), sin(3), tan(3)
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