Use the Laplace transform to find the solution of the ODE y" + 4y = f(t), y(0) = 0, /(0) = 0, ere if tñ.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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2.
Use the Laplace transform to find the solution of the ODE
y" + 4y = f(t), y(0) = 0, y(0) = 0,
where
if t<T
f(t) = { sin(t) , if t>7.
Hint: Since sin(a – b) = sin(a) cos(b) – sin(b) cos(a), then sin(t) = - sin(t – 1).
Now, rewrite f(t) in terms of the Step function uc(t) (take c= 7) and sin(t).
Transcribed Image Text:2. Use the Laplace transform to find the solution of the ODE y" + 4y = f(t), y(0) = 0, y(0) = 0, where if t<T f(t) = { sin(t) , if t>7. Hint: Since sin(a – b) = sin(a) cos(b) – sin(b) cos(a), then sin(t) = - sin(t – 1). Now, rewrite f(t) in terms of the Step function uc(t) (take c= 7) and sin(t).
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