Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 5 - Logarithmic, Exponential, and Other Transcendental Functions - 5.1 Exercises: 56


$\displaystyle \frac{1}{x\ln x}$

Work Step by Step

By theorem 5.3/2:$\ \ \ \displaystyle \frac{d}{dx}[\ln u]=\frac{1}{u}\cdot\frac{du}{dx}=\frac{u^{\prime}}{u},\ \ \ (u>0)$ --------------- Here,$ u(x)=\displaystyle \ln x,\ \ \ u^{\prime}(x)=\frac{1}{x}$ So,$\displaystyle \ \ \ \frac{d}{dx}[\ln$($\ln x$)$]=\displaystyle \frac{1}{\ln x}\cdot\frac{1}{x}=\frac{1}{x\ln x}$
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