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Unsolvable Equation?

  1. Mar 25, 2009 #1
    Solve for x:

    x=d/(1-COS(L/(2*x)))

    where L=28 and d=0.2


    I have been able to get x~490 by "guessing" values for x and computing, then repeating until both sides are equal.

    There must be a better way, although neither my TI-89 nor Mathematica are able to do it.
     
  2. jcsd
  3. Mar 25, 2009 #2

    Mark44

    Staff: Mentor

    It's unsolvable by algebraic methods. The best you can do is to use numerical techniques to get approximate values.
     
  4. Mar 25, 2009 #3
    When I solve this numerically with Maple I get x = 1.0618829.
     
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