for 0sxs 10 for r> 10 sin(x) for 0srs2x for x> 2x

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470
CHAPTER 14 The Fourier Indagral and Transforms
Next compute the sine coefficients
B.
sin(@})d = -
Then, for x>0, we also have
sin(ox) đw.
However, this integral is zero for x=0 and so does not represent f(x) there.
These integral representations are called Laplace's integrals because A, is 2/ times the
Laplace transform of sin(kx), while B, is 2/7 times the Laplace transform of cos(kx).
SECTION 142
PROBLEMS
In each of Problems 1 through 10, find the Fourier
cosine and sine integral representatilons of the func-
tion. Determine what each integral representation
2x+1 for 0sxs*
for x<xs3n
5. S(x)={2
for x> 3r.
converges to.
for 0sxs1
6. r(x)=x+1 for 1<xs2
(* for 0sxs 10
1Ir- for x 10
for x>2
7. r(x)-"cos(*) for x20
8. rCx)xe for x20
9. Let A be a nonzero number and ea positive number,
and
2.8rcx)
Jsin(x) for 0srs 2x
for x> 2x
[1 for 0srs1
3. 1(x) ={2 for 1<rs4
l0 for x>4
[ for 0srsc
f(x) =
0 for x>c
cosh(x) for 0srs5
10
10. S(x) -et cos(x) for x20.
11. Use the Laplace integrals to compute the Fourier
cosine integral of f(x) - 1/(1 + a) and the Fourier
sine Integral of g(a) =x/(1+x).
4. 1(x)=
for x>5
Transcribed Image Text:470 CHAPTER 14 The Fourier Indagral and Transforms Next compute the sine coefficients B. sin(@})d = - Then, for x>0, we also have sin(ox) đw. However, this integral is zero for x=0 and so does not represent f(x) there. These integral representations are called Laplace's integrals because A, is 2/ times the Laplace transform of sin(kx), while B, is 2/7 times the Laplace transform of cos(kx). SECTION 142 PROBLEMS In each of Problems 1 through 10, find the Fourier cosine and sine integral representatilons of the func- tion. Determine what each integral representation 2x+1 for 0sxs* for x<xs3n 5. S(x)={2 for x> 3r. converges to. for 0sxs1 6. r(x)=x+1 for 1<xs2 (* for 0sxs 10 1Ir- for x 10 for x>2 7. r(x)-"cos(*) for x20 8. rCx)xe for x20 9. Let A be a nonzero number and ea positive number, and 2.8rcx) Jsin(x) for 0srs 2x for x> 2x [1 for 0srs1 3. 1(x) ={2 for 1<rs4 l0 for x>4 [ for 0srsc f(x) = 0 for x>c cosh(x) for 0srs5 10 10. S(x) -et cos(x) for x20. 11. Use the Laplace integrals to compute the Fourier cosine integral of f(x) - 1/(1 + a) and the Fourier sine Integral of g(a) =x/(1+x). 4. 1(x)= for x>5
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