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A vector a has components 2p and 1 with...

A vector a has components 2p and 1 with respect to a rectangular cartesian system. This system is rotated through a certain angle about the origin in the counter-clockwise sense. If with respect to new system, a has components `p +1` and 1, then

A

`p = 0 `

B

p = 1or p =-1/3

C

p = -1 or p = 1/3

D

p = 1 or p = -1

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B
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