∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.HasShift C ℤ]
  [inst_2 : CategoryTheory.Preadditive C] [∀ (n : ℤ), (CategoryTheory.shiftFunctor C n).Additive]
  (T : CategoryTheory.Pretriangulated.Triangle Cᵒᵖ),
  CategoryTheory.CategoryStruct.comp
      (Opposite.unop ((CategoryTheory.Pretriangulated.triangleOpEquivalence C).inverse.obj T.rotate)).rotate.mor₂
      (-((CategoryTheory.Pretriangulated.opShiftFunctorEquivalence C 1).unitIso.app T.obj₁).unop).hom =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Iso.refl
          (Opposite.unop
                ((CategoryTheory.Pretriangulated.triangleOpEquivalence C).inverse.obj T.rotate)).rotate.obj₂).hom
      (Opposite.unop ((CategoryTheory.Pretriangulated.triangleOpEquivalence C).inverse.obj T)).mor₂