/// <summary>
/// finds a cos between two vectors (in radians)
/// </summary>
/// <param name="pt1">first operand</param>
/// <param name="pt2">second operand</param>
/// <returns>float cosine</returns>
public static float Cos(GameVector pt1, GameVector pt2)
{
return (float)(Dot(pt1, pt2) / Math.Sqrt(pt1.LengthSquared() * pt2.LengthSquared()));
}
