Question: Is there a way to repeat the subs command?

Is there a way to substitute automatically following expression in every result Maple computes?

diff(omega_3(t),t)=alpha_3(t)

For example, when I'd like to compute the following derivative:

diff(omega_2(t)+omega_3(t),t)

it should return

alpha_2(t)+alpha_3(t)

Thanks in advance.

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