(a) Consider a function f: R,R that is locally integrable and of exponential order and denote the Laplace transform of f by F(s) = L {f(t); 8}. Prove that for all N EN L{tNf(t); s} = (-1)N d dsN F(s).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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5.
(a) Consider a function f: R,R that is locally integrable and of exponential order and
denote the Laplace transform of f by F(s) = L {f(t); s}. Prove that for all N EN
L{tN{(1); s} = (-1)N d
dsN F(s).
(b) Use the Laplace transform to find the solution to the initial value problem
#(t) = 8t sin(t) cos(t) with (0) = (0) = 0.
%3D
(c) Consider a 27-periodic function f : R, R (i.e. f(t+2) = f(t) for all te R+) that is
locally integrable and of exponential order. Prove that
27
1
L{f(!); s} =
f(t)e-st dt.
1-e-2rs
Hint: You may use without proof
for 0<r<1.
Transcribed Image Text:5. (a) Consider a function f: R,R that is locally integrable and of exponential order and denote the Laplace transform of f by F(s) = L {f(t); s}. Prove that for all N EN L{tN{(1); s} = (-1)N d dsN F(s). (b) Use the Laplace transform to find the solution to the initial value problem #(t) = 8t sin(t) cos(t) with (0) = (0) = 0. %3D (c) Consider a 27-periodic function f : R, R (i.e. f(t+2) = f(t) for all te R+) that is locally integrable and of exponential order. Prove that 27 1 L{f(!); s} = f(t)e-st dt. 1-e-2rs Hint: You may use without proof for 0<r<1.
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