theorem extracted_formal_statement_1.{u_2, u_1} {Ω : Type u_1} [inst : MeasurableSpace Ω] {μ : Measure Ω}
  [inst_1 : IsProbabilityMeasure μ] {E : Type u_2} [inst_2 : NormedAddCommGroup E] {f : Ω → E} {C : ℝ}
  (h : ∀ᵐ (x : Ω) ∂μ, ‖f x‖ ≤ C) (this : μ Set.univ = 1) (h_original_goal : C * (μ Set.univ).toReal = C) :
  C * ENNReal.toReal 1 = C := sorry

State before:
Ω : Type u_1
inst✝³ : MeasurableSpace Ω
μ : Measure Ω
inst✝² : IsProbabilityMeasure μ
E : Type u_2
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
f : Ω → E
C : ℝ
h : ∀ᵐ (x : Ω) ∂μ, ‖f x‖ ≤ C
this : μ Set.univ = 1
⊢ C * (μ Set.univ).toReal = C

Tactic: rw [this]

State after:
[Ω : Type u_1
 inst✝³ : MeasurableSpace Ω
 μ : Measure Ω
 inst✝² : IsProbabilityMeasure μ
 E : Type u_2
 inst✝¹ : NormedAddCommGroup E
 inst✝ : NormedSpace ℝ E
 f : Ω → E
 C : ℝ
 h : ∀ᵐ (x : Ω) ∂μ, ‖f x‖ ≤ C
 this : μ Set.univ = 1
 ⊢ C * ENNReal.toReal 1 = C]

Relevant lemmas: