{J : Type u₁} →
  [inst : CategoryTheory.Category.{v₁, u₁} J] →
    {C : Type u₃} →
      [inst_1 : CategoryTheory.Category.{v₃, u₃} C] →
        {D : Type u₄} →
          [inst_2 : CategoryTheory.Category.{v₄, u₄} D] →
            (H : CategoryTheory.Functor C D) →
              {F G : CategoryTheory.Functor J C} →
                {α : F ≅ G} →
                  {c : CategoryTheory.Limits.Cocone G} →
                    H.mapCocone ((CategoryTheory.Limits.Cocones.precomposeEquivalence α).functor.obj c) ≅
                      (CategoryTheory.Limits.Cocones.precomposeEquivalence
                              (CategoryTheory.Functor.isoWhiskerRight α H)).functor.obj
                        (H.mapCocone c)