...
> other is f(y) = f(2*x**2).
>
> So I think that when I change the independent variable like this, I
> should also change the name of the function. What would be the best
> way to do that?
The whole thing or just this:
>>> f(x).subs(f, g)
g(x)
>>> f(x).replace(f,g)
g(x)
>>> f(x).xreplace({f:g})
f(x)
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