Question: Hide function with respect to variable in output

Suppose we have functions dependent on certain variables.  I don't want the dependencies explicitly shown in the output.  How do I hide them?

For example

f(x)+f(x)^2-(diff(y(t), t)) = diff(y(t), t, t)
                         

I would like just f not f(x) and similarily just y instead of y(t) shown.

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