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: 7,395 Thanks: 2476 Math Focus: Mainly analysis and algebra 
Line 3 of $b_n$ derivation. $2\cos n\pi$ should be $\cos 2n\pi$.

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.


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