00 L{cos}(s) = -st e cos(at) dt u cos(at) dv e^(-st)dt du = -asin(at)du v =| (-1/s)e^(-st) 00 (a/s)e^(-st)sin(at)dt - U = als*sin(at) dv e^(-st)dt du = (a^2/s)*cos(at)dt v = (-1/s)e^(-st) 00 00 1/s als(-1/s)e^(-st)*sin(at)) a? 00 1/s e^(-st)cos(at)dt 82 Notice that this last integral is the same as the integral we started with. Treat this like an equation and move the integral to the left hand side: 1 e-at cos(at) dt - Therefore Je-t cos(at) dt s/(a^2+s^2) || || ||
00 L{cos}(s) = -st e cos(at) dt u cos(at) dv e^(-st)dt du = -asin(at)du v =| (-1/s)e^(-st) 00 (a/s)e^(-st)sin(at)dt - U = als*sin(at) dv e^(-st)dt du = (a^2/s)*cos(at)dt v = (-1/s)e^(-st) 00 00 1/s als(-1/s)e^(-st)*sin(at)) a? 00 1/s e^(-st)cos(at)dt 82 Notice that this last integral is the same as the integral we started with. Treat this like an equation and move the integral to the left hand side: 1 e-at cos(at) dt - Therefore Je-t cos(at) dt s/(a^2+s^2) || || ||
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question

Transcribed Image Text:L{cos}{s) = /
-st
e
cos(at) dt
U =
cos(at)
dv
e^(-st)dt
du
-asin(at)du
v = (-1/s)e^(-st)
00
(a/s)e^(-st)sin(at)dt
-
U =
als*sin(at)
dv
e^(-st)dt
du
(a^2/s)*cos(at)dt
v =
(-1/s)e^(-st)
00
00
1/s
a/s((-1/s)e^(-st)*sin(at))
a?
00
1/s
e^(-st)cos(at)dt
s2
Notice that this last integral is the same as the integral we started with. Treat this like an
equation and move the integral to the left hand side:
1
e-st cos(at) dt -
Therefore
st
cos(at) dt
s/(a^2+s^2)
||
||
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