My Math Forum Fourier Analysis problem

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 October 24th, 2017, 02:19 PM #1 Newbie   Joined: Oct 2017 From: Hamburg Posts: 2 Thanks: 1 Fourier Analysis problem Hey folks, I don't get to the right result. I think that I've made an algebraic mistake somewhere. Checked it many times. Can anyone help me? Not sure if this is the right way to get help here. Please correct me if I am doing something wrong! Thanks! Last edited by gunjah292; October 24th, 2017 at 02:25 PM.
 October 24th, 2017, 04:17 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,329 Thanks: 2454 Math Focus: Mainly analysis and algebra Line 3 of $b_n$ derivation. $2\cos n\pi$ should be $\cos 2n\pi$. Thanks from topsquark and gunjah292
 October 25th, 2017, 12:05 AM #3 Newbie   Joined: Oct 2017 From: Hamburg Posts: 2 Thanks: 1 Thanks a lot! I should always put the arguments in brackets, as long as I am not sure with the algebra yet. Thanks from v8archie

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