`BookProof.ChapterEulerNState.exists_cos_sq` {q : ℝ} (h0 : 0 ≤ q) (h1 : q ≤ 1) : ∃ θ : ℝ, Real.cos θ ^ 2 = q

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`BookProof.ChapterEulerNState.exists_cos_sq` {q : ℝ} (h0 : 0 ≤ q) (h1 : q ≤ 1) : ∃ θ : ℝ, Real.cos θ ^ 2 = q · Prove2Me