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y = 4 sin (pi)/(2) (2t + (x)/(8)) fi...

`y = 4 sin (pi)/(2) (2t + (x)/(8))`
find A, `lambda` & phase difference of same particle at time intervals of 0.4 sec & phase difference at any given instant of two particles 12 cm apart.

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`A = 4, lambda = 32, trianglephi = 72^(@), trianglephi = (3pi)/(4)
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