Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 2 - Section 2.2 - The Limit of a Function - 2.2 Exercises - Page 94: 52


a) let $x=\frac{1}{k\pi}$ where k is an integer $f(\frac{1}{k\pi})=\tan\frac{1}{\frac{1}{k\pi}}=\tan(k\pi)=0$ b) let $x=\frac{4}{(4k+1)\pi}$ where k is an integer $f(\frac{4}{(4k+1)\pi})=\tan\frac{1}{\frac{4}{(4k+1)\pi}}=\tan\frac{(4k+1)\pi}{4}=\tan(\frac{\pi}{4}+k\pi)=1$ c) From previous parts, it is evident that $\tan\frac{1}{x}$ oscillates between 0 and 1 infinitely as $x$ approaches 0 from the right. Since $f(x)$ does not approach a fixed value as x approaches 0 from the right, $\lim\limits_{x \to 0^+}\tan\frac{1}{x}$ does not exist.

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