Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 9 - Infinite Series - 9.8 Maclaurin And Taylor Series; Power Series - Exercises Set 9.8 - Page 667: 18

Answer

$1+\Sigma_{k=1}^{\infty} \dfrac{(-1)^{k-1}(x-e)^k}{ke^k}(x-e)^k$

Work Step by Step

The Maclaurin Series is $ \displaystyle\sum\limits_{n=0}^{\infty} \frac{f^n(0)x^n} {n!} = f(0) + f'(0)x + \frac{(f''(0)x^2)}{2!} + ..\\ $ $f(x)=\ln x$ Differentiate $f'(x)=\dfrac{1}{x}$ $f''(x)=\dfrac{-1}{x^2}$ $f'''(x)=\dfrac{2}{x^3}$ Now $f(e)=1$ , $f'(e)=\dfrac{1}{e}$ , $f''(e)=\dfrac{-1}{e^2}$, $f'''(e)=\dfrac{2}{e^3}$ Hence the Maclaurin Series for the function is $\displaystyle 1+\dfrac{1}{e}(x-e)-\dfrac{1}{2e^2}(x-e)^2 .......+ \dfrac{(-1)^{n-1}(x-e)^n}{ne^n} =1+\Sigma_{k=1}^{\infty} \dfrac{(-1)^{k-1}(x-e)^k}{ke^k}(x-e)^k$
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