I am asked to state whether the variable is independent or dependent for the equation $$ \frac{d}{dx}\left(x\frac{df}{dx}\right)+f=0 $$ How do you know which are dependent and independent? What about for the equation: $$ \frac{dy}{dx}=\frac{1}{\log \left| x+x^2+e^x+e^{x^2} \right|}? $$
Differential Equation dependent or independent
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