I am trying to assign a function which is a derivative of a previous on:
f[x_] := x^2;
D[f[x], x]
I would like j to be the derivative of f, so it would be also a function of x (namely, 2x)
How do I do that?
Trying to use do it with the following line gives an error
j[x_] := D[f[x], x]
j[1]
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