(d) (e) (f) What happens if f(x) is an odd function? Express the following periodic function by a Fourier series. f(x) k The 0 -k - (a) The given function f(x) (Periodic rectangular wave) 1 Using the result in (e), calculate the value of 1 1 1 + —— 357 79
(d) (e) (f) What happens if f(x) is an odd function? Express the following periodic function by a Fourier series. f(x) k The 0 -k - (a) The given function f(x) (Periodic rectangular wave) 1 Using the result in (e), calculate the value of 1 1 1 + —— 357 79
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
D,E, and F only
![2.
A periodic function is defined by f(x + p) = f(x), where p is the period of f(x). Assume a
periodic function is with period 27 and the inner product of 2 periodic functions is defined as
1
•2π
27 10²t* f.gdt.
(f.g) =
(a)
Please verify that = {1, cos x, cos 2x, ..., cos mx, .... sin x, sin 2x, ..., sin nx, ...} is
an orthogonal set in a Hilbert space defined in C([0, 27]) and m, n are positive integers.
(b)
Demonstrate that a periodic function f(x) with a period of 27 can be expressed as a linear
combination of ß by f(x) = a₁ + Σ(a, cos nx+b, sin nx) and find such a; and b¡. Such an
00
n=1
(c)
(d)
(e)
expression is called as Fourier series after the name of Joseph Fourier, a French
mathematician.
Prove that if f(x) is an even function, then all b;'s are 0.
What happens if f(x) is an odd function?
Express the following periodic function by a Fourier series.
f(x)
k
THE
0
-k
- [[]]
2π
(a) The given function f(x) (Periodic rectangular wave)
1
Using the result in (e), calculate the value of 1-
3
+
1 1 1
--+-
5 7 9](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F56658202-f4b1-4176-ad55-5e6ba5c24317%2Fa8d37549-cee1-4d79-aecd-be5af1c7e318%2Fu5ruh43e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2.
A periodic function is defined by f(x + p) = f(x), where p is the period of f(x). Assume a
periodic function is with period 27 and the inner product of 2 periodic functions is defined as
1
•2π
27 10²t* f.gdt.
(f.g) =
(a)
Please verify that = {1, cos x, cos 2x, ..., cos mx, .... sin x, sin 2x, ..., sin nx, ...} is
an orthogonal set in a Hilbert space defined in C([0, 27]) and m, n are positive integers.
(b)
Demonstrate that a periodic function f(x) with a period of 27 can be expressed as a linear
combination of ß by f(x) = a₁ + Σ(a, cos nx+b, sin nx) and find such a; and b¡. Such an
00
n=1
(c)
(d)
(e)
expression is called as Fourier series after the name of Joseph Fourier, a French
mathematician.
Prove that if f(x) is an even function, then all b;'s are 0.
What happens if f(x) is an odd function?
Express the following periodic function by a Fourier series.
f(x)
k
THE
0
-k
- [[]]
2π
(a) The given function f(x) (Periodic rectangular wave)
1
Using the result in (e), calculate the value of 1-
3
+
1 1 1
--+-
5 7 9
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