Here we consider the 2n-periodic function f: R → R, that is given by f(2) = | sin()| for |æ| < . a) Use Eulers formulas to show, that the functions complex Fourier series f(x) = E-, Cneinx is given by 1 2/2(-1)" – 4 Cn = for n E Z. 16n2 – 1 -

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.6: Additional Trigonometric Graphs
Problem 77E
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Here we consider the 2n-periodic function f: R → R, that is given by
f (x) = | sin()|
for |æ| < T.
a) Use Eulers formulas to show, that the functions complex Fourier series
f(x) = E- Cneinz
is given by
1 2/2(-1)" – 4
Cn =
for n e Z.
16n2 – 1
φ.ψε 1?(-π, π])
b) In the space L2 ([-n, T]) there is a inner product for arbitrary
by
(9, 4) = / p(x)\(x) dx.
Determine whether the Fourier series for f (x) converges uniformly on R to f (x), converges
pointwise to f (x), converges to f (x) with respect to the norm on L? ([-n, T]). Justify the
-T,
answers.
c) Her we consider the function h(x) given by the parameters 1_1, 1o and 1, as
h(x) = A-1e¬i* + do + A1e²ª.
Determine for 1-1 = -3, Xo = -2, A1 = –1
L? ([-T, 1]).
Explain how the parameters 1_1do and 1, must be selected to obtain the smallest value of the
if h has the smallest possible distance to f in
I = S", || sin(4)| –- A1ei – do – A_1e-i|² dx.
integral
Specify these values of 1_1, 2o and 4.
Transcribed Image Text:Here we consider the 2n-periodic function f: R → R, that is given by f (x) = | sin()| for |æ| < T. a) Use Eulers formulas to show, that the functions complex Fourier series f(x) = E- Cneinz is given by 1 2/2(-1)" – 4 Cn = for n e Z. 16n2 – 1 φ.ψε 1?(-π, π]) b) In the space L2 ([-n, T]) there is a inner product for arbitrary by (9, 4) = / p(x)\(x) dx. Determine whether the Fourier series for f (x) converges uniformly on R to f (x), converges pointwise to f (x), converges to f (x) with respect to the norm on L? ([-n, T]). Justify the -T, answers. c) Her we consider the function h(x) given by the parameters 1_1, 1o and 1, as h(x) = A-1e¬i* + do + A1e²ª. Determine for 1-1 = -3, Xo = -2, A1 = –1 L? ([-T, 1]). Explain how the parameters 1_1do and 1, must be selected to obtain the smallest value of the if h has the smallest possible distance to f in I = S", || sin(4)| –- A1ei – do – A_1e-i|² dx. integral Specify these values of 1_1, 2o and 4.
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