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Equation of motion in the same direction...

Equation of motion in the same direction is given by `y_1=Asin(omegat-kx)`,`y_2=Asin(omegat-kx-theta)`. The amplitude of the medium particle will be

A

`2 A "cos"(theta)/(2)`

B

`2A cos theta`

C

`sqrt2 A cos. (theta)/(2)`

D

`sqrt2 A cos theta`

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