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单词 TaylorExpansionOfsqrt1x
释义

Taylor expansion of 1+x


The Taylor seriesMathworldPlanetmath for  f(x)=1+x  using the

T(x)=k=0f(k)(a)k!(x-a)k

is given in the table below for the first few .


k
expansionsimplifiedat  a=0
0f(a)(1+a)1/21
1f(a)(x-a)12(1+a)-1/2(x-a)12x
2f(2)(a)2!(x-a)2-18(1+a)-3/2(x-a)2-18x2
3f(3)(a)3!(x-a)3348(1+a)-5/2(x-a)3116x3
4f(4)(a)4!(x-a)4-15384(1+a)-7/2(x-a)4-5128x4
5f(5)(a)5!(x-a)51053840(1+a)-9/2(x-a)57256x5
6f(6)(a)6!(x-a)6-94546080(1+a)-11/2(x-a)6-211024x6
Table 1: Taylor Series for f(x)=1+x

The general coefficient of the expansion, for n2is:

f(n)(a)n!=(12n)(1+a)12-n
=12(-12)(-32)(12-(n-1))n(n-1)(n-2)1(1+a)-2n-12
=12(-12)n-113(2n-3)n(n-1)(n-2)1(1+a)-2n-12
=(-1)n-12nn!(2n-3)!(2n-4)(2n-6)2(1+a)-2n-12
=(-1)n-1(2n-3)!22n-2n!(n-2)!(1+a)-2n-12.
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更新时间:2025/5/4 19:51:55