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Homework Statement
the answer that i get is different with the answer provided , is my answer wrong ? i got ( cos(2n -1) / 2n-1 )instead of ( cos(n+1) / n+1 )
Homework Equations
The Attempt at a Solution
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I am not interested in the graph, I just wanna know the final answer....It's easy enough to check yourself. Try plotting each series. You only need 4 or 5 terms each.
www.desmos.com is useful if you don't have access to plotting software.
I actually followed vela's good advice, and the result is telling ...I am not interested in the graph, I just wanna know the final answer....
Cos(n +1 ) pi= (-1)^n.... What can we conclude from that??I actually followed vela's good advice, and the result is telling ...
Another test you could try: what happens with the given solution (answer b) when x=π?
No, that is not correct.Cos(n +1 ) pi= (-1)^n.... What can we conclude from that??
It's (-1) ^ (n +1)No, that is not correct.
##\cos 2 \pi = \cos (1+1) \pi \neq {(-1)}^1##
Once you have the correct values, plug them in into the Fourier series of answer (b).
Correct.It's (-1) ^ (n +1)