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In the sample exam solutions for Question 2, the i, j, k vectors are found first and then all normalised at once afterwards. This is incorrect. It should be done the same way as the week 6 tutorial in question 1 where there is a similar question which normalises the k vector first and uses the normalised k vector to then find the i vector and then uses the normalised i vector to find the j vector.
Sorry for the confusion.