For a real Laurent polynomial f in u/s of width 2 with f(−λ̄) = 0, the real pencil space W(λ, f) contains u² and ū²

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For a real Laurent polynomial f in u/s of width 2 with f(−λ̄) = 0, the real pencil space W(λ, f) contains u² and ū² · Prove2Me