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Proof, Inequalities

  1. Sep 5, 2010 #1
    1. The problem statement, all variables and given/known data


    The problem and my half solution is given. How do I proceed with the proof?
     

    Attached Files:

  2. jcsd
  3. Sep 5, 2010 #2
    Try using the triangle inequality. Your proof is flawed.

    Or use a proof by contradiction.
     
    Last edited: Sep 5, 2010
  4. Sep 5, 2010 #3
    It is easy to find out when equality holds for the triangle inequality. This is key to your problem.
     
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