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How to solve this equation?

  1. Feb 22, 2012 #1
    I tried to solve this equation. can anyone please look at this and tell me if this is correct? If not help me out please.

    Last edited: Feb 22, 2012
  2. jcsd
  3. Feb 22, 2012 #2
    You can find out whether it is correct by subtituting it back into the equation. I think it doesn't quite work out the final answer seems still to be dependent on r.

    In the second line you are suddenly missing a term from the product rule.
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