-- Mathlib/CategoryTheory/Closed/Monoidal.lean
theorem ofEquiv_uncurry_def {X Y Z : C} :
    letI := ofEquiv F adj
    ∀ (f : Y ⟶ (ihom X).obj Z), MonoidalClosed.uncurry f =
      ((Iso.compInverseIso (H := adj.toEquivalence)
          (Functor.Monoidal.commTensorLeft F X)).inv.app Y) ≫
            (adj.toEquivalence.symm.toAdjunction.homEquiv _ _).symm
              (MonoidalClosed.uncurry ((adj.homEquiv _ _).symm f))

Proof state:
C : Type u
inst✝⁶ : Category.{v, u} C
inst✝⁵ : MonoidalCategory C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
inst✝³ : MonoidalCategory D
F : C ⥤ D
G : D ⥤ C
adj : F ⊣ G
inst✝² : F.Monoidal
inst✝¹ : F.IsEquivalence
inst✝ : MonoidalClosed D
X Y Z : C
f : Y ⟶ (ihom X).obj Z
⊢ ({
              homEquiv := fun X_1 Y =>
                (Adjunction.equivHomsetLeftOfNatIso (Functor.Monoidal.commTensorLeft F X).compInverseIso.symm).trans
                  ((adj.comp ((ihom.adjunction (F.obj X)).comp adj.toEquivalence.symm.toAdjunction)).homEquiv X_1 Y),
              homEquiv_naturality_left_symm := ⋯, homEquiv_naturality_right := ⋯ }.homEquiv
          Y Z).symm
      f =
    (Functor.Monoidal.commTensorLeft F X).compInverseIso.inv.app Y ≫
      (adj.toEquivalence.symm.toAdjunction.homEquiv ((F ⋙ tensorLeft (F.obj X)).obj Y) Z).symm
        (uncurry ((adj.homEquiv Y ((ihom (F.obj X)).obj (adj.toEquivalence.symm.inverse.obj Z))).symm f))

Tactic:
dsimp

Result:
C : Type u
inst✝⁶ : Category.{v, u} C
inst✝⁵ : MonoidalCategory C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
inst✝³ : MonoidalCategory D
F : C ⥤ D
G : D ⥤ C
adj : F ⊣ G
inst✝² : F.Monoidal
inst✝¹ : F.IsEquivalence
inst✝ : MonoidalClosed D
X Y Z : C
f : Y ⟶ (ihom X).obj Z
⊢ (Adjunction.equivHomsetLeftOfNatIso (Functor.Monoidal.commTensorLeft F X).compInverseIso.symm).symm
      (((adj.comp ((ihom.adjunction (F.obj X)).comp adj.toEquivalence.symm.toAdjunction)).homEquiv Y Z).symm f) =
    (Functor.Monoidal.commTensorLeft F X).compInverseIso.inv.app Y ≫
      (adj.toEquivalence.symm.toAdjunction.homEquiv (F.obj X ⊗ F.obj Y) Z).symm
        (uncurry ((adj.homEquiv Y ((ihom (F.obj X)).obj (F.obj Z))).symm f))

Proof state:
C : Type u
inst✝⁶ : Category.{v, u} C
inst✝⁵ : MonoidalCategory C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
inst✝³ : MonoidalCategory D
F : C ⥤ D
G : D ⥤ C
adj : F ⊣ G
inst✝² : F.Monoidal
inst✝¹ : F.IsEquivalence
inst✝ : MonoidalClosed D
X Y Z : C
f : Y ⟶ (ihom X).obj Z
⊢ (Adjunction.equivHomsetLeftOfNatIso (Functor.Monoidal.commTensorLeft F X).compInverseIso.symm).symm
      (((adj.comp ((ihom.adjunction (F.obj X)).comp adj.toEquivalence.symm.toAdjunction)).homEquiv Y Z).symm f) =
    (Functor.Monoidal.commTensorLeft F X).compInverseIso.inv.app Y ≫
      (adj.toEquivalence.symm.toAdjunction.homEquiv (F.obj X ⊗ F.obj Y) Z).symm
        (uncurry ((adj.homEquiv Y ((ihom (F.obj X)).obj (F.obj Z))).symm f))

Tactic:
rw [Adjunction.comp_homEquiv, Adjunction.comp_homEquiv]

Result:
C : Type u
inst✝⁶ : Category.{v, u} C
inst✝⁵ : MonoidalCategory C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
inst✝³ : MonoidalCategory D
F : C ⥤ D
G : D ⥤ C
adj : F ⊣ G
inst✝² : F.Monoidal
inst✝¹ : F.IsEquivalence
inst✝ : MonoidalClosed D
X Y Z : C
f : Y ⟶ (ihom X).obj Z
⊢ (Adjunction.equivHomsetLeftOfNatIso (Functor.Monoidal.commTensorLeft F X).compInverseIso.symm).symm
      (((fun x x_1 =>
              ((fun x x_2 =>
                      (adj.toEquivalence.symm.toAdjunction.homEquiv ((tensorLeft (F.obj X)).obj x) x_2).trans
                        ((ihom.adjunction (F.obj X)).homEquiv x (F.obj x_2)))
                    (F.obj x) x_1).trans
                (adj.homEquiv x ((F ⋙ ihom (F.obj X)).obj x_1)))
            Y Z).symm
        f) =
    (Functor.Monoidal.commTensorLeft F X).compInverseIso.inv.app Y ≫
      (adj.toEquivalence.symm.toAdjunction.homEquiv (F.obj X ⊗ F.obj Y) Z).symm
        (uncurry ((adj.homEquiv Y ((ihom (F.obj X)).obj (F.obj Z))).symm f))