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A wave pulse moving along the x axis is ...

A wave pulse moving along the `x` axis is represented by the wave funcation
`y(x, t) = (2)/((x - 3t)^(2) + 1)`
where `x` and `y` are measured in `cm` and `t` is in seconds.
`(i)` in which direction is the wave moving ?
`(ii)` Find speed of the wave.
`(iii)` Plot the waveform at `t = 0, t = 2s`.

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