1. Using Taylor's theorem you can approximate different functions aroimd a ceT- tain point, as you have seen so in Theory and Example videos. Furthermore. you can approximate functions around 0. (a) So, using the idea of Maclaurin series expansion, find the expansion of cos(e), and show that (-1)* (2k + 1)! sin(@) = Be clever in this question, you do not need to expand to too many teris. and after some time you shall start seeing a pattern. You can then gen- eralize your expansion to the one shown in the L.H.S of Eq(1). (b) In similar fashion show that the Maclaurin series expansion of cos(#), and show that (-1 (2k)! Cos(8) (c) Using the power series expansion in Eq(1) and Eq(2) show that cos(0) = sin(@) + e %3D (d) Using the power series expansion in Eq(1) and Eq(2) show that tan(0) +t 15 113

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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1) a,b,c,d

1. Using Taylor's theorem you can approximate different functios around a cer-
tain point, as you have seen so in Theory and Example videos. Furthermore,
you can approximate functions around 0.
(a) So, using the idea of Maclaurin series expansion, find the expansion of
cos(8), and show that
(-1)
(2k + 1)!
sin(@)
k-0
Be clever in this question, you do not need to expand to too many ternns.
and after some time you shall start seeing a pattern. You can then gen-
eralize your expansion to the one shown in the L.H.S of Eq(I).
(b) In similar fashion show that the Maclaurin series expansion of cos(#), and
show that
Cos(8) = S(-1)*
(2k)!
A-0
(c) Using the power series expansion in Eq(1) and Eq(2) show that
|cos(0) = sin(@) +e
(d) Using the power series expansion in Eq(1) and Eq(2) show that
tan(@) = 0
3.
15
2. (a) The n distinct nth roots of unity are the solutions of w"= 1.
i. Show that the n nth roots of unity are given by
(1)/
2kn
%3COS
2k
+isin
k= 0,1, 2, ..n – 1.
Transcribed Image Text:1. Using Taylor's theorem you can approximate different functios around a cer- tain point, as you have seen so in Theory and Example videos. Furthermore, you can approximate functions around 0. (a) So, using the idea of Maclaurin series expansion, find the expansion of cos(8), and show that (-1) (2k + 1)! sin(@) k-0 Be clever in this question, you do not need to expand to too many ternns. and after some time you shall start seeing a pattern. You can then gen- eralize your expansion to the one shown in the L.H.S of Eq(I). (b) In similar fashion show that the Maclaurin series expansion of cos(#), and show that Cos(8) = S(-1)* (2k)! A-0 (c) Using the power series expansion in Eq(1) and Eq(2) show that |cos(0) = sin(@) +e (d) Using the power series expansion in Eq(1) and Eq(2) show that tan(@) = 0 3. 15 2. (a) The n distinct nth roots of unity are the solutions of w"= 1. i. Show that the n nth roots of unity are given by (1)/ 2kn %3COS 2k +isin k= 0,1, 2, ..n – 1.
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