∀ {C : Type u_1} {D : Type u_2} [inst : CategoryTheory.Category.{v_1, u_1} C]
  [inst_1 : CategoryTheory.Category.{v_2, 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] [inst_7 : F.Additive]
  (X : CategoryTheory.Pretriangulated.Triangle C),
  (F.mapTriangleRotateIso.inv.app X).hom₂ = CategoryTheory.CategoryStruct.id (F.obj X.obj₃)