- #1

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This is the issue: d(xf)/dx= ?

This is just the product rule, so I think: x(df/dx) + f (dx/dx)= x (df/dx) + f

But I'm afraid that I don't even understand my own notation anymore (how embarrassing)...

if I had a derivative like x (d/dx), would this just be the derivative of x, i.e. 1? So what does x df/dx mean? You can't simplify that anymore, right? Maybe I just need to go reread my calc 1 textbook..