Hi, I have a really quick question. In solving for the derivative of arctanx, you know how you start with tany = x, and then you take d/dx of both sides? Why is it in the next step that it suddenly becomes "d/dy (tan(y))dy/dx" instead of "d/dx (tan(y))dy/dx"? How did it suddenly change from d/dx to d/dy? Thanks!

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Thanks so much! That really helped to clear things up!

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