∀ {𝕜 : Type u} [inst : NontriviallyNormedField 𝕜] {F : Type v} [inst_1 : NormedAddCommGroup F]
  [inst_2 : NormedSpace 𝕜 F] {f f₁ : 𝕜 → F} {x : 𝕜} {s : Set 𝕜},
  f₁ =ᶠ[nhdsWithin x s] f → f₁ x = f x → derivWithin f₁ s x = derivWithin f s x