∀ {C : Type u_4} {D : Type u_2} [inst : CategoryTheory.Category.{u_3, u_4} C]
  [inst_1 : CategoryTheory.Category.{u_1, u_2} D] [inst_2 : CategoryTheory.HasShift C ℤ]
  [inst_3 : CategoryTheory.HasShift D ℤ] (F : CategoryTheory.Functor C D) [inst_4 : F.CommShift ℤ]
  [inst_5 : CategoryTheory.Preadditive C] [inst_6 : CategoryTheory.Preadditive D] [F.Additive] (n : ℤ)
  (T : CategoryTheory.Pretriangulated.Triangle C),
  CategoryTheory.CategoryStruct.comp
      (((CategoryTheory.Pretriangulated.Triangle.shiftFunctor C n).comp F.mapTriangle).obj T).mor₂
      ((CategoryTheory.Functor.commShiftIso F n).app T.obj₃).hom =
    CategoryTheory.CategoryStruct.comp ((CategoryTheory.Functor.commShiftIso F n).app T.obj₂).hom
      ((F.mapTriangle.comp (CategoryTheory.Pretriangulated.Triangle.shiftFunctor D n)).obj T).mor₂