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Question: Equation Extraction Problem

HW4.msim 

I did the base part of a robot in the MapleSim. I am trying to get the differential equation of the system, but the MapleSim gave me 2 different differential equations. When I use these differential equations, I could not reach to my goal. I think I need only one differential equation whose degree must be 2. The system works well, but the problem is a differential equation of the system. How can I get the correct differential equation? And also, why are there 2 different equations? Which one represents what? Thanks for answering.

 

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