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How to handle this type of equations?

  1. Jan 23, 2010 #1
    Hi friends. I have encountered three equations that I need to find three variable An, Bn, Cn. First two are easy to handle but third one includes multiplication of infinite series(fourier series).
    First two are like:
    17w9l3.gif

    Third equation is this:
    et5fdl.gif
    Dm is known but in order to derive a general solution we behave as if it is not known. Therefore expressions of An, Bn, Cn may include Dm. Because I can not handle 3rd equation I cant find the soulution for An, Bn and Cn. How can I deduce an equation like first two from third equation? Can we make use of orthonality principle? Any idea? Thanks in advance.
     

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    Last edited: Jan 23, 2010
  2. jcsd
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