∀ (C : Type u_2) [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.HasShift C ℤ]
  (T : CategoryTheory.Pretriangulated.Triangle Cᵒᵖ),
  CategoryTheory.CategoryStruct.comp
      (((CategoryTheory.Pretriangulated.TriangleOpEquivalence.inverse C).comp
              (CategoryTheory.Pretriangulated.TriangleOpEquivalence.functor C)).obj
          T).mor₂
      (CategoryTheory.Iso.refl
          (((CategoryTheory.Pretriangulated.TriangleOpEquivalence.inverse C).comp
                  (CategoryTheory.Pretriangulated.TriangleOpEquivalence.functor C)).obj
              T).obj₃).hom =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Iso.refl
          (((CategoryTheory.Pretriangulated.TriangleOpEquivalence.inverse C).comp
                  (CategoryTheory.Pretriangulated.TriangleOpEquivalence.functor C)).obj
              T).obj₂).hom
      ((CategoryTheory.Functor.id (CategoryTheory.Pretriangulated.Triangle Cᵒᵖ)).obj T).mor₂