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Two sound waves are represented by `y_1=1/2sin omegat+sqrt3/2 cos omegat` and `y_2=sqrt3/2 sin omegat+1/2cos omegat.` The initial phase difference between the two waves is
A. |
`30^o` |
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B. |
`60^o` |
C. |
`45^o` |
D. |
`0^o` |