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Question: Why can't the expression processed by 'convertsys' be recognized?

Question:Why can't the expression processed by 'convertsys' be recognized?

GFY 65 Maple
collect convertsys
18 hours ago
0

Why can't the sys0 extracted using the convertsys command be processed with collect? However, when I extract its amplitude and then perform collect again, it works. Why is this happening? Is there a good method to handle this? I feel that copying it out is inconvenient for subsequent modifications.

nature_frequency_question.mw
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