no goals
C : Type u_1
D : Type u_2
E : Type ?u.69364
inst✝² : Category C
inst✝¹ : Category D
inst✝ : Category E
⊢ functorExtension₂ C D ⋙ (whiskeringLeft C (Karoubi C) (Karoubi D)).obj (toKaroubi C) =
    (whiskeringRight C D (Karoubi D)).obj (toKaroubi D)
simp only [functorExtension₂, Functor.assoc, functorExtension₁_comp_whiskeringLeft_toKaroubi,
  Functor.comp_id]