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Persamaan Umum Gelombang
∂Ψ∂t
=∂Ψ∂t∂ x∂ x
=∂x∂ t∂Ψ∂ x
=v ∂Ψ∂ x
Diturunkan terhadap t
∂∂ t∂Ψ∂ t
= ∂∂ t (v ∂Ψ∂ x ) ∂ x∂ x=∂x∂ t ∂∂ x (v ∂Ψ∂ x )
∂2Ψ∂t 2
=v2 ∂2Ψ∂ x2