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Suppose that u is a vector pointing north-
west with u · u = 12. Which of the following
vectors is equal to u written in Cartesian
form? (Here the unit vector x points
towards the east and the unit vector y
points north.)*
O -12i+ 12)
6 x - 6 y
O -6 x+ 6 y
12 x + 12 y
O None of the above

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pls help ASAP, not sure what I did wrong, thanks!
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