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`BookProof.DampedOscillatorEnergy.coupledEnergy_not_constant_of_damped` {lam1 lam2 omega1 omega2 c : ℝ} {x1 x2 v1 v2 a1 a2 : ℝ → ℝ} (hlam1 : 0 < lam1) (hlam2 : 0 ≤ lam2) (hx1 : ∀ t · Prove2Me