have Icc_sub : Icc a b ⊆ Ioi 0 := (Icc_subset_Ioi_iff h).mpr ha
𝕂 : Type u_1
inst✝ : _root_.RCLike 𝕂
a b : ℝ
f g : ℝ → ℂ
ha : 0 < a
h : a ≤ b
fSupp : Function.support f ⊆ Icc a b
fDiff : DifferentiableOn ℝ f (Ioi 0)
gDiff : DifferentiableOn ℝ g (Ioi 0)
fderivCont : ContinuousOn (deriv f) (Ioi 0)
gderivCont : ContinuousOn (deriv g) (Ioi 0)
⊢ ∫ (x : ℝ) in Ioi 0, f x * deriv g x = -∫ (x : ℝ) in Ioi 0, deriv f x * g x
𝕂 : Type u_1
inst✝ : _root_.RCLike 𝕂
a b : ℝ
f g : ℝ → ℂ
ha : 0 < a
h : a ≤ b
fSupp : Function.support f ⊆ Icc a b
fDiff : DifferentiableOn ℝ f (Ioi 0)
gDiff : DifferentiableOn ℝ g (Ioi 0)
fderivCont : ContinuousOn (deriv f) (Ioi 0)
gderivCont : ContinuousOn (deriv g) (Ioi 0)
Icc_sub : Icc a b ⊆ Ioi 0
⊢ ∫ (x : ℝ) in Ioi 0, f x * deriv g x = -∫ (x : ℝ) in Ioi 0, deriv f x * g x