Find the Fourier series for the periodic function defined by f(x) = e*, –n < x < n. Hint: Recall that sinh x = (ex – e-)/2. Sketch the graph of the sum of this series on the interval -5n s xs 5a.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Part B

5. (a) Find the Fourier series for the periodic function defined by f(x) =
e*, –n < x < T. Hint: Recall that sinh x = (ex – e-*)/2.
(b) Sketch the graph of the sum of this series on the interval
-5n s x s 5n.
(c) Use the series in (a) to establish the sums
1
1
n2 +1
1
-1
2 tanh n
and
(-1)" _ 1[
-1
n² +1_2[sinh n
Transcribed Image Text:5. (a) Find the Fourier series for the periodic function defined by f(x) = e*, –n < x < T. Hint: Recall that sinh x = (ex – e-*)/2. (b) Sketch the graph of the sum of this series on the interval -5n s x s 5n. (c) Use the series in (a) to establish the sums 1 1 n2 +1 1 -1 2 tanh n and (-1)" _ 1[ -1 n² +1_2[sinh n
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