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Cosine sequence

psyclones
in Homework Help

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Hi, I've been pulling my hair out trying to solve this. If we treat it as a series similar to proof by induction it can be simplified. Am I on the right track. But the LHS doesn't appear to factorize and reduce in any easy way!

2017-10-24.pdf

Edited by psyclones
attached doc

  • psyclones changed the title to Cosine sequence
  • 2 weeks later...

  One error is that taking n= k+ 1 in cos(2nx) gives cos(2(k+ 1)x)= cos((2k+ 2)x), not cos((2k+1)x) as you have.

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