Use a second degree Taylor polynomial to approximate the two solutions to cos(x) = 3/4 in the interval (-"/2, "/2).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.5: Iterative Methods For Solving Linear Systems
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Taylor Polynomials! I would appreciate any assistance! The more explanation the better.

Use a second degree Taylor polynomial to approximate the two solutions to cos(x) = 3/4 in
the interval (-"/2, "/2).
Transcribed Image Text:Use a second degree Taylor polynomial to approximate the two solutions to cos(x) = 3/4 in the interval (-"/2, "/2).
Expert Solution
Step 1

Given that,

The function cosx=34

We want to find two solutions of cosx=34 using second-degree Taylor polynomial

Take f(x)=cosx-34

We need to find Taylor's polynomial at x =0.

The Taylor series approximation is given by formula,

f(x)=f(0)+f'(0)1!x+f''(0)2!x2+...+fn(0)n!

 

Step 2

f(x)=cosx-34

f(0)=cos0-34=1-34=14

f'(x)=-sinx

f'(0) =-sin(0) =0

f''(x)=-cosxf''(0)= -cos(0) =-1

Thus the second-degree Taylors approximation is,

f(x)=14+01!x+-12!x2=14-12x2

 

 

 

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