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Sum of cosins

  1. Jun 22, 2006 #1
  2. jcsd
  3. Jun 22, 2006 #2

    Tide

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    HINT: Write the cosine in (complex) exponential form and sum the geometric series.
     
  4. Jun 23, 2006 #3
    yes Tide.... you can do it that way
    also there is anthour easy way to solve the proplem
     
  5. Jun 23, 2006 #4

    Tide

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    Well then don't keep us in suspense - please share! :)
     
  6. Jun 24, 2006 #5
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