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I think he shows us the derivation to establish some kind of fundamentals, but it really just confuses the [censored] out of me. I don't think we would ever be asked to derive them on a test, just to apply them to problems similar to homework and tests.
I have asked some of the TA's and UA's this question and they said he has begun to stray away from asking for a straight up derivation but I would not totally cancel it out as a possible conceptual problem for the final. Honestly its not too hard to memorize the steps as there is a pattern you can follow for all orders. It also helps that he gives the derived equation on the constants sheet so you can check your answer and derivation.
My TA has brought it up in our discussion section and he told us to be familiar with the derivation, but it is unlikely that he will ask on an exam but I still think we should know it as he spent some time in class talking about the derivations. Llavelle did mention why he did that in lecture and it is to give us a more basic fundamental understanding of where the equations we use come from.
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