Hint and solution correct - but possibly not suitable for first years

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The matrix in Hint 2 is correct (my bad :-( ). However, it appears that it would be hard for a student to figure out how to derive the matrix in Hint 2. Perhaps an easier way (assuming they have covered change of basis matrices) is to simply state that under the change of bases (conjugation by an appropriate rotation), the two matrices become


Best, Brian

BRIANCHAN (talk)19:47, 12 March 2018