`BookProof.DampedOscillatorEnergy.hasDerivAt_dampedEnergy` {lam omega : ℝ} {x v a : ℝ → ℝ} (hx : ∀ t, HasDerivAt x (v t) t) (hv : ∀ t, HasDerivAt v (a t) t) (heq : ∀ t, a t + lam *

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`BookProof.DampedOscillatorEnergy.hasDerivAt_dampedEnergy` {lam omega : ℝ} {x v a : ℝ → ℝ} (hx : ∀ t, HasDerivAt x (v t) t) (hv : ∀ t, HasDerivAt v (a t) t) (heq : ∀ t, a t + lam * · Prove2Me