Calculus, 10th Edition (Anton)

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

Chapter 6 - Exponential, Logarithmic, And Inverse Trigonometric Functions - 6.5 L'Hopital's Rule; Indeterminate Forms - Exercises Set 6.5 - Page 448: 40

Answer

$1$

Work Step by Step

Our aim is to evaluate the limit for $\lim\limits_{x \to + \infty} x^{1/x}$ Let us consider that $y=\lim\limits_{x \to + \infty} x^{1/x} \implies \ln y=\lim\limits_{x \to + \infty} \dfrac{\ln (x)}{x}$ Apply L-Hospital's rule which can be defined as: $\lim\limits_{x \to a} \dfrac{P(x) }{Q(x)}=\lim\limits_{x \to a}\dfrac{P'(x)}{Q'(x)}$ where, $a$ can be any real number, infinity or negative infinity. $\ln y= \lim\limits_{x \to + \infty} \dfrac{1}{x} \\=0$ Thus, we have: $ y=e^0=1$
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