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Proving a set is orthogonal

  1. Oct 17, 2013 #1
    1. The problem statement, all variables and given/known data

    ZI9L53P.png

    2. Relevant equations



    3. The attempt at a solution

    zPYzL5K.png

    I'm not sure how to prove that it is zero. I don't see what I can do after the second last step.
     
  2. jcsd
  3. Oct 17, 2013 #2

    arildno

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    Dearly Missed

    What does sin(integer*pi) equal?
     
  4. Oct 17, 2013 #3
    It's equal to zero.

    Wow. My trigonometry is terrible.
     
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