18. Show that the expression ξ (x, t) = Acos (`

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18. Show that the expression ξ (x, t) = Acos (ωt - kx) satisfies the wave equation ∂2ξ / ∂x2 = 1 / υ2∂2ξ / ∂t2 provided that ω = kυ.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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