Question: Fixing the solution to this problem

Hi, so I'm trying to solve this equation, but it seems that I've ran into two issues with it:

My problems with this this is such:

  • The pi^2 did not get integrated into the solution, it's just a pi^2. I would rather it not be like that, but the actual resulting number from that division
  • The units should result in Ω, but it's not, instead it just added the units from the original variables. How do I make it set to the "correct" unit?

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