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Write all the unit vectors in X Y-p l a ...

Write all the unit vectors in `X Y-p l a n edot`

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Verified by Experts

We know that
`å = xî + yỹ + zk`
Since the vector is in `X-Y` plane, there is no `Z` coordinate.
Hence,
`å = xî + yỹ + 0k`
...
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