A vector bar(a) has components 2p and 1 ...

A vector `bar(a)` has components 2p and 1 w.r.t a rectangular cartesian system. It is rotated through a certain angle about the origin in the counter clockwise direction. With respect to the new system, if `bar(a)` has components p +1, 1 then p =

`(1, (-1)/3)`

`(1, 1/3)`

`(-1, 1/3)`

`(-1, (-1)/3)`

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