Begin with the Maclaurin (Taylor) series: 7² 2¹ 2-6 cos x = 1 2! 4! 6! (a) Evaluate cos (). (b) List the zeros of cos r. (c) Expand cos z as an infinite product in the form where a, b, c, ... are the zeros of cosa. 1 + P(z)-(1-) (1-) (1-5)---

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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Begin with the Maclaurin (Taylor) series:
.2
cos r = 1 -
2!
4!
+..
6!
(a) Evaluate cos 0.
(b) List the zeros of cos r.
(c) Expand cos r as an infinite product in the form
P(z) = (1 - ) (1 - ) (1 -)...
where a, b, c, ... are the zeros of cos r.
(d) Equate the coefficients of the quadratic term in the Taylor expansion of
cos r to the corresponding coefficient in the infinite product representa-
tion of cos r obtained in part (c).
(e) Use the result in part (d) above to derive the sum of the reciprocals of
the squares of the odd integers:
1
1
+
9
1.
+
25
49
81
8
Transcribed Image Text:Begin with the Maclaurin (Taylor) series: .2 cos r = 1 - 2! 4! +.. 6! (a) Evaluate cos 0. (b) List the zeros of cos r. (c) Expand cos r as an infinite product in the form P(z) = (1 - ) (1 - ) (1 -)... where a, b, c, ... are the zeros of cos r. (d) Equate the coefficients of the quadratic term in the Taylor expansion of cos r to the corresponding coefficient in the infinite product representa- tion of cos r obtained in part (c). (e) Use the result in part (d) above to derive the sum of the reciprocals of the squares of the odd integers: 1 1 + 9 1. + 25 49 81 8
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