How can I launch a GameObject at a target if I am given everything except for its launch angle?

I have been working on this one for a few weeks, and I have yet to succeed. I have searched every resource out there, and tried them all, but still without success, so I do not believe existing links will be of much use to me at this point. I have purchased scripts from the Asset Store in hopes of finding some usable code there, but no such luck.

I am trying to launch an object at a target, given its position, its target position, the launch force, and the gravity. I am following this formula:

I have simplified the code to the best of my ability, but I still cannot consistently hit the target. (I am not actually launching the origin itself, but it seemed simpler than having code instantiating another GameObject.)

Does anyone know what I am doing wrong?

 using UnityEngine;
 
 public class Launcher : MonoBehaviour
 {
     public float speed = 10.0f;
 
     void Start()
     {
         Launch(GameObject.Find("Target").transform);
     }
 
     public void Launch(Transform target)
     {
         float angle = GetAngle(transform.position, target.position, speed, -Physics2D.gravity.y);
         var forceToAdd = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle));
         GetComponent<Rigidbody2D>().AddForce(forceToAdd, ForceMode2D.Impulse);
     }
 
     private float GetAngle(Vector2 origin, Vector2 destination, float force, float gravity)
     {
         float angle = 0.0f;
 
         //Labeling variables to match formula
         float x = Mathf.Abs(destination.x - origin.x);
         float y = Mathf.Abs(destination.y - origin.y);
         float v = force;
         float g = gravity;
 
         //Formula seen above
         float valueToBeSquareRooted = Mathf.Pow(v, 4) - g * (g * Mathf.Pow(x, 2) + 2 * y * Mathf.Pow(v, 2));
         if (valueToBeSquareRooted >= 0)
         {
             angle = Mathf.Atan(Mathf.Deg2Rad * (Mathf.Pow(v, 2) + Mathf.Sqrt(valueToBeSquareRooted)) / g * x);
         }
         else
         {
             //Destination is out of range
         }
 
         return angle;
     }
 }

Again, I have spent weeks on this problem. I am at the end of my mental rope. Please help!