/// <summary>
/// Atan2関数の評価
/// </summary>
/// <param name="node">Atan2ノード</param>
/// <returns>演算後の数値(Double)</returns>
public override object Visit(Atan2Node node)
{
return(Math.Atan2((double)Visit(node.X), (double)Visit(node.X)));
}
public abstract T Visit(Atan2Node node);
