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The equation of a moving progressive wav...

The equation of a moving progressive wave is given by `y= 1/(x^2-4xt+4t^2+8)`, where x and y are in metre and t is in second . Hence speed and direction of propagation of pulse is

A

`4 m/s, +ve x-axis`

B

`4 m/s, -ve x-axis`

C

`2 m/s, +ve x-axis`

D

`2 m/s, -ve x-axis`

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