1.ArcSin
public static double ArcSin(double a)
{
if (Math.Abs(a) == 1.0) return Math.PI / 2.0;
else return Math.Atan(a / Math.Sqrt(1 - a * a));
}
{
if (Math.Abs(a) == 1.0) return Math.PI / 2.0;
else return Math.Atan(a / Math.Sqrt(1 - a * a));
}
1.ArcSin