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17 hours ago vote accept Lawton
yesterday comment added E. Chan-López (+1) Great answer. The way you uncover the required algebraic extension and only then factor is particularly elegant.
2 days ago comment added yarchik (+) This is an amazing solution. Each step is very clear. This approach can probably be applied to many questions here. It should be added that for general complex $U$ the initial and the final expressions are not equivalent, but that's a different story.
2 days ago history edited azerbajdzan CC BY-SA 4.0
deleted 111 characters in body
2 days ago history edited azerbajdzan CC BY-SA 4.0
deleted 111 characters in body
2 days ago history answered azerbajdzan CC BY-SA 4.0