Why did we plug in x = 1/2 at the last part of the solution for the second problem

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.3: Geometric Sequences
Problem 49E
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Why did we plug in x = 1/2 at the last part of the solution for the second problem.

x2
Find a power series representation for f(x)
1+ x3*
By differentiating the power series obtained in (a), find the exact value of
(-1)"(3n + 2)
n=0
Transcribed Image Text:x2 Find a power series representation for f(x) 1+ x3* By differentiating the power series obtained in (a), find the exact value of (-1)"(3n + 2) n=0
Solution: (a)
Here,
メ)ニ
1+x3
ニ
1-(-x3)
ニx2
nニD
3n
り=D
3n+2,
3n +2
x)-Eー) x
ーIhis rel Ihe
(i)
り=D
haquired power beris representadion of fexy
6) Noo, diffeeren tiading) both Sided of Cis vilh
tusfeed to
De get
3n +1
(**(1+x*5') = tg"( 3n+2) x*"**
nニD
の
→ 2×(1+ッジー(+ッジx= Ee)"en+) x
* うゃ)x +
3ntl
ラ
n=D
3 x4
で+xリー
ニ
1+x3
Transcribed Image Text:Solution: (a) Here, メ)ニ 1+x3 ニ 1-(-x3) ニx2 nニD 3n り=D 3n+2, 3n +2 x)-Eー) x ーIhis rel Ihe (i) り=D haquired power beris representadion of fexy 6) Noo, diffeeren tiading) both Sided of Cis vilh tusfeed to De get 3n +1 (**(1+x*5') = tg"( 3n+2) x*"** nニD の → 2×(1+ッジー(+ッジx= Ee)"en+) x * うゃ)x + 3ntl ラ n=D 3 x4 で+xリー ニ 1+x3
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