refine ⟨contDiff_exp_real_smul_I, ?_⟩
𝕜 : Type u_1
E : Type u_2
inst✝³ : NontriviallyNormedField 𝕜
inst✝² : NormedAlgebra 𝕜 ℝ
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
⊢ Function.HasTemperateGrowth fun x => cexp (x • I)
𝕜 : Type u_1
E : Type u_2
inst✝³ : NontriviallyNormedField 𝕜
inst✝² : NormedAlgebra 𝕜 ℝ
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
⊢ ∀ (n : ℕ), ∃ k C, ∀ (x : ℝ), ‖iteratedFDeriv ℝ n (fun x => cexp (x • I)) x‖ ≤ C * (1 + ‖x‖) ^ k