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Taylor series was hard in that I can always recognize the pattern, but I could not derive the formula for the pattern (ex. 2^x-1) or something. So that was tough. Other stuff were not "hard" conceptually, just hard in because you have to practice a lot, or I did.
It was definitely one of my harder courses though.
Haha yeah, the taylor series was probably the hardest thing for me in calc 2 as well. The rest wasn't all to bad.