simp [mul_comm (↑(n - i) : 𝕜)]
case succ.h.refine_1
𝕜 : Type u_1
inst✝ : NontriviallyNormedField 𝕜
n i : ℕ
IH : (iteratedDeriv i fun x => x ^ n) = fun x => ↑(Nat.descFactorial n i) * x ^ (n - i)
x : 𝕜
⊢ ↑(Nat.descFactorial n i) * ↑(n - i) = ↑(Nat.descFactorial n (Nat.succ i))
no goals