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Given below are some functions of x and ...

Given below are some functions of x and t to represent the displacement(transverse of longitudinal ) of an elastic wave. State which of these represent(i) a travelling wave,(ii) a stationary wave or (iii) none at all Y
`y=2cos(3x) sin(10t)`

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This equation has two harmonic functions of x and t, so it represents a stationary wave
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