∀ {𝕜 : Type u_1} {F : Type u_2} [inst : NontriviallyNormedField 𝕜] [inst_1 : NormedAddCommGroup F]
  [inst_2 : NormedSpace 𝕜 F] (f : 𝕜 → F) (a : 𝕜) (s : Set 𝕜) (x : 𝕜),
  derivWithin (fun x => f (x + a)) s x = derivWithin f (a +ᵥ s) (x + a)