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