no goals
α : Type u_1
β : Type u_2
γ : Type ?u.82300
f g : α → β
c c₁ c₂ x✝ : α
inst✝ : AddSemigroup α
h : Periodic f c
a x : α
⊢ (fun x => f (a + x)) (x + c) = (fun x => f (a + x)) x
simpa [add_assoc] using h (a + x)