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Using graphical means find an amplitude ...

Using graphical means find an amplitude `a` of oscillations resulting from the superposition of the following oscillations of the same direction `:`
`(a)``x_(1)=3.0 cos (omegat+pi//3), x_(2)=8.0 sin (omega t+ pi//6),`
`(b)` `x_(1)=3.0 cos omegat, x_(2)=5.0 cos (omegat+pi//4), x_(3)=6.0 sin omegat.`

A

`14`

B

`7`

C

`4`

D

`2`

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The correct Answer is:
B
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