(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I need to prove the equation attached. I also have to describe why the integrals vanish.

2. Relevant equations

3. The attempt at a solution

I am not sure how to begin. Our teacher told us this equation is known as the orthogonality condition for sines. I also know that n' is a positive integer. I think if I get help starting this I will be able to proceed.

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# Prove Orthogonality Condition For Sines (Integral)

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