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Image PostPart of me wants to thank my professor when he pulls this sort of thing on a quiz, but the other part of me just thinks it's laziness. (i.redd.it)

submitted by USASocks

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Image PostIm an engineering student taking cal 1 and everyday when I enter my class there are these formulas left by the previous class on the board. I was wondering if anyone could explain what these deal with or what class they are for, thanks. (imgur.com)

submitted by kylumitati