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QUESTION
Why do you need to derive (from the problem: d/dl of (l/g + R^2/2gl)) to find the minimum length. I understand how to solve this problem up until I
Why do you need to derive (from the problem: d/dl of (l/g + R^2/2gl)) to find the minimum length. I understand how to solve this problem up until I had to derive? May you please explain? (Please see attached file for question)
