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The vibrations of a string fixed at both ends are represented by `y=16Sin((pix)/15)Cos(96pit).`Where 'x' and 'y' are in cm and 't' in seconds. Then the phase difference between the points at x= 13 cm and x= 16 in radian is
A. |
`pi/5` |
B. |
`pi` |
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C. |
0 |
D. |
`(2pi)/5` |