1. The Fourier series to represent a function f(x) in the interval -L SX SL, nxxx nxx 1(x)=+ Σan cos +b sin L can be written in complex form, inxx f(x) = Σ che l with complex Fourier coefficients inxx Сп f(x)e L dx. Show that the complex Fourier series satisfies the following properties. (a) co= Co ao for n=0 [2] 2 (b) C = (an ibn) for n=1,2.... (c) c = (a + ib. n) for n=-1,-2.... inxx (d) The complex basis functions, e L are orthogonal in the sense that L inxx imxx Sele e Le L dx= where m is an integer. 0 if m⭑n 2L if m=n

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter34: Maxwell’s Equations And Electromagnetic Waves
Section: Chapter Questions
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1. The Fourier series to represent a function f(x) in the interval -L SX SL,
nxxx
nxx
1(x)=+
Σan cos
+b sin
L
can be written in complex form,
inxx
f(x) = Σ che l
with complex Fourier coefficients
inxx
Сп
f(x)e L dx.
Show that the complex Fourier series satisfies the following properties.
(a) co=
Co
ao
for n=0 [2]
2
(b) C = (an ibn) for n=1,2....
(c) c = (a + ib. n) for n=-1,-2....
inxx
(d) The complex basis functions,
e L
are orthogonal in the sense that
L
inxx imxx
Sele
e Le L dx=
where m is an integer.
0 if m⭑n
2L if m=n
Transcribed Image Text:1. The Fourier series to represent a function f(x) in the interval -L SX SL, nxxx nxx 1(x)=+ Σan cos +b sin L can be written in complex form, inxx f(x) = Σ che l with complex Fourier coefficients inxx Сп f(x)e L dx. Show that the complex Fourier series satisfies the following properties. (a) co= Co ao for n=0 [2] 2 (b) C = (an ibn) for n=1,2.... (c) c = (a + ib. n) for n=-1,-2.... inxx (d) The complex basis functions, e L are orthogonal in the sense that L inxx imxx Sele e Le L dx= where m is an integer. 0 if m⭑n 2L if m=n
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