psyclones Posted March 13, 2018 Share Posted March 13, 2018 (edited) 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 March 13, 2018 by psyclones attached doc Link to comment Share on other sites More sharing options...
Country Boy Posted March 24, 2018 Share Posted March 24, 2018 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. Link to comment Share on other sites More sharing options...
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