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Get Full Access to Calculus: Early Transcendentals - 1 Edition - Chapter 9.1 - Problem 82e
Get Full Access to Calculus: Early Transcendentals - 1 Edition - Chapter 9.1 - Problem 82e

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# Best expansion point Suppose you wish to approximate cos

ISBN: 9780321570567 2

## Solution for problem 82E Chapter 9.1

Calculus: Early Transcendentals | 1st Edition

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Problem 82E

Problem 82E

Best expansion point Suppose you wish to approximate cos (π/12) using Taylor polynomials. Is the approximation more accurate if you use Taylor polynomials centered at 0 or ? Use a calculator for numerical experiments and check for consistency with Theorem 9.2. Does the answer depend on the order of the polynomial?

Step-by-Step Solution:

Solution 82E

Step 1:

Given function  is  f(x) = cos(x)

General  expression of Taylor series of  a function f(x) centered at ‘a’ is ;

f(a) +(x-a) +++.............

Consider , f(x) = cos(x) , then f(0) = cos(0) = 1

= -sin(x) , then     = -sin(0)  =0

= - cos(x) , then     = -cos(0)  = -1

= sin(x) , then     = sin(0)  = 0

=  cos(x) , then     = cos(0)  = 1……………..

Therefore , the Taylor polynomial  of the function f(x) = cos(x)with center zero is ;

cos(x) = 1 - + -+.............

Take x =  , then  we get ,

cos() = 1 - + -+.............

1 - 0.0342694597+1.95732644986-.........

0.9659262729

Step 2 of 3

Step 3 of 3

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