University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 13 - Section 13.4 - The Chain Rule - Exercises - Page 711: 28

Answer

$-(2+\ln 2)$

Work Step by Step

Since, we have $\dfrac{dy}{dx}=-\dfrac{F_x}{F_y}$ ...(1) Now, need to plug the derivatives in equation (1). we have $\dfrac{e^y+y \cos xy}{xe^y+x \cos xy+1} \times (-1)=\dfrac{-e^y -y \cos xy}{xe^y+x \cos xy+1} $ Now, plug the point $(0,\ln 2)$ Since, $e^{\ln 2}=2$ Thus, we get $\dfrac{-(e^{\ln 2} +(\ln 2) \cos (0) (\ln 2))}{0+0+1} =-\dfrac{2+\ln 2}{1} =-(2+\ln 2)$
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