Math/Physics

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What is an expression for the standing wave that is produced by adding the two waves
(2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t]
and
(2.5 cm)sin[(3.0 m-1)x + (27 s-1)t]

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    Write an expression for the standing wave produced by adding the two waves (2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] and (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t].

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