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**No Logic Sense** I have tried and tried to read the pages in my math book about it, but I just can't seem to understand what is meant by the dy/dx?

So far, I have seen this in implicit differentiation, integration by parts and integration by substitution.

It seems like dy/dx is differentiation? But why do you use it in integration as well? And why do you sometimes differentiate with y and other times with x and so on.

I don't get this at all. I have tried to read it in my school book but they don't even tell you what it's for. They just say that when you need to do one of the three methods, you just multiply by dy/dx and etc. It makes no sense to me. every time I see the dy/dx I just get confused and i have no idea what's going on....