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Question: How can I collect(,diff) in the Physics package?

Question:How can I collect(,diff) in the Physics package?

Hullzie16 333 Maple 2023
collect physics
May 11 2023
1

I would like to collect in derivatives of a function(s) in a worksheet where I have the Physics package loaded but It does not want to do it. When I bring the expression to a blank worksheet it does everything just fine. Am I missing something small? Or is there additional commands/options I need to input? 

Thoughts?

CollectDiff.mw
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