Exists root error three

import Mathlib.Analysis.Complex.Basic
import Mathlib.Data.Complex.Basic
import Mathlib.LinearAlgebra.Matrix.Determinant.Basic
import Mathlib.Tactic.FieldSimp
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Mathlib.Tactic.NormNum
import Mathlib.Tactic.Ring

section
namespace D1Bound5









theorem _root_.D1Bound5.exists_root_error_three (x t : ℂ)
    (hx : 3 ≤ ‖x‖) (ht : t^2 = x*(x+1)) :
    ∃ v : ℂ, (v=t ∨ v=-t) ∧
      ‖v-x‖ < (5/9 : ℝ) ∧
      ‖(v-x)-(1/2 : ℂ)‖ < (25/486 : ℝ) := by sorry



end D1Bound5
end