So I don't understand why if you have something like U(x,y) = f(y+2x)(adsbygoogle = window.adsbygoogle || []).push({});

and you take [tex]\frac{\partial U}{\partial x}

= \frac{\partial f}{\partial x} [/tex]

you get [tex]\frac{df}{d(y+2x)} * \frac{d(y+2x)}{dx}[/tex]

Why does the partial derivative just change to the total derivative for one variable? It seems like you just treat x and y+2x as the same variable? thanks for any help!!

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# Partial derivative of a single variable function

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