∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Preadditive C]
  [inst_2 : CategoryTheory.MonoidalCategory C] [CategoryTheory.MonoidalPreadditive C] {W X Y Z : C} (f : W ⟶ X)
  (g h : Y ⟶ Z),
  CategoryTheory.MonoidalCategoryStruct.tensorHom f (g + h) =
    CategoryTheory.MonoidalCategoryStruct.tensorHom f g + CategoryTheory.MonoidalCategoryStruct.tensorHom f h