40. (a) The graph of the function f is shown in Fig. 10.1.10. Show that f can be written in the form f(t) = (-1)"u(t – n). n=0 (b) Use the method of Problem 39 to show that 1 L{f(1)} = s(1 + e-$)' |f 1 2 3 4 5 6 FIGURE 10.1.10. The graph of the function of Problem 40.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 64E
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please do number 40, I show number 39 because it asks for it 

40. (a) The graph of the function f is shown in Fig. 10.1.10.
Show that f can be written in the form
f(t) = E(-1)"u(t – n).
%3D
uplace
n=0
(b) Use the method of Problem 39 to show that
1
L{f(t)} =
%3D
s(1 + e-s)'
|f
1
1 2 3
4
5 6
FIGURE 10.1.10. The graph of the function
of Problem 40.
Transcribed Image Text:40. (a) The graph of the function f is shown in Fig. 10.1.10. Show that f can be written in the form f(t) = E(-1)"u(t – n). %3D uplace n=0 (b) Use the method of Problem 39 to show that 1 L{f(t)} = %3D s(1 + e-s)' |f 1 1 2 3 4 5 6 FIGURE 10.1.10. The graph of the function of Problem 40.
39. The unit staircase function is defined as follows:
f(t) = n
if
n – 1 <t < n,
n = 1,2, 3, . ..
%3D
(a) Sketch the graph of f to see why its name is appropri-
ate. (b) Show that
f (t) = u(t –n)
%3D
I
n=0
for all t 2 0. (c) Assume that the Laplace transform of the
infinite series in part (b) can be taken termwise (it can).
Apply the geometric series to obtain the result
1
L{f(t)} =
s(1 – e-s)
Transcribed Image Text:39. The unit staircase function is defined as follows: f(t) = n if n – 1 <t < n, n = 1,2, 3, . .. %3D (a) Sketch the graph of f to see why its name is appropri- ate. (b) Show that f (t) = u(t –n) %3D I n=0 for all t 2 0. (c) Assume that the Laplace transform of the infinite series in part (b) can be taken termwise (it can). Apply the geometric series to obtain the result 1 L{f(t)} = s(1 – e-s)
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