Calculus: Early Transcendentals 9th Edition

Published by Cengage Learning
ISBN 10: 1337613924
ISBN 13: 978-1-33761-392-7

Chapter 3 - Section 3.6 - Derivatives of Logarithmic Functions - 3.6 Exercises - Page 224: 18

Answer

$g'\left( t \right) = \frac{1}{t} + \frac{{8t}}{{{t^2} + 1}} - \frac{2}{{3\left( {2t - 1} \right)}}$

Work Step by Step

$$\eqalign{ & g\left( t \right) = \ln \frac{{t{{\left( {{t^2} + 1} \right)}^4}}}{{\root 3 \of {2t - 1} }} \cr & {\text{First we must rewrite the given function using logarithmic}} \cr & {\text{properties:}} \cr & {\text{Use the logaritmic property ln}}\left( {\frac{a}{b}} \right) = \ln a - \ln b \cr & g\left( t \right) = \ln t{\left( {{t^2} + 1} \right)^4} - \ln \root 3 \of {2t - 1} \cr & {\text{Use the logaritmic property ln}}\left( {ab} \right) = \ln a + \ln b \cr & g\left( t \right) = \ln t + \ln {\left( {{t^2} + 1} \right)^4} - \ln {\left( {2t - 1} \right)^{1/3}} \cr & {\text{Use the logaritmic property }}\ln {a^n} = n\ln a \cr & g\left( t \right) = \ln t + 4\ln \left( {{t^2} + 1} \right) - \frac{1}{3}\ln \left( {2t - 1} \right) \cr & {\text{Differentiate}} \cr & g'\left( t \right) = \frac{d}{{dt}}\left[ {\ln t} \right] + 4\frac{d}{{dt}}\left[ {\ln \left( {{t^2} + 1} \right)} \right] - \frac{1}{3}\frac{d}{{dt}}\left[ {\ln \left( {2t - 1} \right)} \right] \cr & {\text{Use the formula }}\frac{d}{{dt}}\left( {\ln u} \right) = \frac{1}{u}\frac{{du}}{{dt}},{\text{ }}\left( {{\text{see page 218}}} \right),{\text{ }} \cr & g'\left( t \right) = \frac{1}{t} + 4\left( {\frac{{2t}}{{{t^2} + 1}}} \right) - \frac{1}{3}\frac{d}{{dt}}\left[ {\ln \left( {2t - 1} \right)} \right] \cr & {\text{compute the derivative and simplify}} \cr & g'\left( t \right) = \frac{1}{t} + 4\left( {\frac{{2t}}{{{t^2} + 1}}} \right) - \frac{1}{3}\left( {\frac{2}{{2t - 1}}} \right) \cr & g'\left( t \right) = \frac{1}{t} + \frac{{8t}}{{{t^2} + 1}} - \frac{2}{{3\left( {2t - 1} \right)}} \cr} $$
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