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Minimizing and optimization related rate problem

  1. Sep 13, 2014 #1
    I would like to ask for help solving this problem. I've been at this problem for a few hours without making any progress.

    There is a picture of the problem attached in this thread.

    So, the question is what is the length of side 'X' used in order to get the shortest possible length for side 'R'. The given value for the triangle are 14 cm on one side and a 40° angle.

    what are the steps in approaching the problem?
     

    Attached Files:

  2. jcsd
  3. Sep 14, 2014 #2
    Maybe someone can point to me a source on the internet to understand the concept a bit more?
     
  4. Sep 14, 2014 #3
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