∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Preadditive C]
  [inst_2 : CategoryTheory.HasShift C ℤ] [inst_3 : ∀ (n : ℤ), (CategoryTheory.shiftFunctor C n).Additive]
  (X : CategoryTheory.Pretriangulated.Triangle C),
  (CategoryTheory.Pretriangulated.invRotCompRot.inv.app X).hom₃ =
    (CategoryTheory.shiftFunctorCompIsoId C (-1) 1 ⋯).inv.app X.obj₃