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Four simple harmonic vibrations y(1)=8...

Four simple harmonic vibrations
`y_(1)=8 sin omega t`, `y_(2)= 6 sin (omega t+pi//2)`, `y_(3)=4 sin (omega t+pi)`, `y_(4)=2sin(omegat+3pi//2)`
are susperimposed on each other. The resulting amplitude and phase are respectively.

A

`4sqrt(2)` and `tan^(-1)(1)`

B

`4sqrt(2)` and `tan^(-1)(6//8)`

C

`20` and `tan^(-1)(1//2)`

D

`20` and `tan^(-1)(2)`

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