University Calculus: Early Transcendentals (3rd Edition)

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

Chapter 15 - Section 15.5 - Surfaces and Area - Exercises - Page 873: 47

Answer

$2 \ln 2+3$

Work Step by Step

Here, we have $r_x=\lt 1,0,2x-(2/x)\gt$ and $r_{\theta}=\lt 0, 1, \sqrt {15} \gt$ Also, $|r_x\times r_{y}|=\dfrac{2}{x}+2x$ Thus, the area is given by $A=\int_1^{2} \int_0^{1} (\dfrac{2}{x}+2x) dy dx$ or, $A=[2 \ln x+x^2]_1^{2}= 2 \ln 2+3$
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