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I got something similar to saskia but not the same. I used the quotient rule for the derivative and we got to the same place until the foiling at the bottom. I may be wrong but maybe the foiling part is what got weird

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I'm not really sure where I messed up. Maybe someone could tell me?

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It could be better, but here's the link with the Geogebra file I made to check my work.
https://www.geogebra.org/classic/gkvtuwtk
I forgot the notation and while I looked through my notes and the dropbox and think I found the correct notation, I am not 100% certain. Please forgive me.

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I was confused about proper notation with this problem.

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I wasn't particularly confused about this one but I noticed no one else had posted it so I thought I'd post my attempt.

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I choose #44 because I struggled solving it and then checking it it was pretty straight forward. however looking at Mari's post the answers are different.