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A plane harmonic wave of frequency 440 H...

A plane harmonic wave of frequency 440 Hz propagates in a medium in a direction that makes angle `60^(@)C` with x-axis as well as y-axis, find the phase difference between the oscillation at the point of medium whose coordinates are 91,1,2) and (2,3,1). the velocity of the wave in the medium is 220m/s.

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`(2pi(3sqrt(2)-2))/(sqrt(2))`
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