Question: how to extract u(t) or x(t) from f := Diff(u(t),t$2)+Diff(u(t),t)+x(t);

f := Diff(u(t),t$2)+Diff(u(t),t)+u(t)+x(t);

 

after indicate to extract u(t), should output Diff(u(t),t$2)+Diff(u(t),t)+u(t)

after indicate to extract x(t), should output x(t)

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