∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  [inst_2 : CategoryTheory.MonoidalCategory D] (X : CategoryTheory.Functor C (CategoryTheory.Comon D)) (X_1 : C),
  ((CategoryTheory.Monoidal.ComonFunctorCategoryEquivalence.counitIso.inv.app X).app X_1).hom =
    CategoryTheory.CategoryStruct.id (X.obj X_1).X