Помогите найти ошибку в расчете математической функции - C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace lab2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "0,01655";
            textBox2.Text = "-2,75";
            textBox3.Text = "0,15";
        }
        private void button1_Click(object sender, EventArgs e)
        {
            double x = double.Parse(textBox1.Text);
            double y = double.Parse(textBox2.Text);
            double z = double.Parse(textBox3.Text);
 
            double a = Math.Pow(x, 1.0/3);//x^1/3
            double b = y + 2;//y+2
            double c = Math.Pow(x,b);//x^(y+2)
            double d = 10*(a + c);//10*(x^1/3+x^(y+2)
            double koren = Math.Sqrt(d);//koren iz d
 
            double skobka = Math.Pow(Math.Asin(z),2) - Math.Abs(x - y);//arcsin^2(z)-|x-y|;
            double complite = koren * skobka;
 
            textBox4.Text = complite.ToString(); 
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}