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Imagine you've done a derivation 1000 times, the 1001st time you did it you wouldn't be consulting a formula sheet on how to properly do it. You cannot conduct legal arguments in this way as it is almost antithecal and dangerous to absent-mindedly "apply and make legal arguments". Do you understand what I mean by what I said that in STEM you can memorize things (to a different extent)? Pythagoras theorem hasn't changed from the last time you did it
An uncertain mathematician checks the formula sheet, a certain lawyer still checks the law