The idea is that I have a defined function of $n$ variables. I want to find out $n$ and get partial derivation for each of variables,
Suppose you have a function
f[w_,x_,y_,z_]: = w^2+x^2+y^2+z^2
Is it possible to find partial derivation using - say - 3rd variable (in this case $y$), that is
$\frac{df}{dy} = 2 y$?
Derivative
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