Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 6 - Applications of the Integral - 6.3 Volumes of Revolution - Exercises - Page 304: 11



Work Step by Step

The volume is given by $$ \pi\int_{\pi/4}^{3\pi/4} \csc^2x d x=\pi \left.\cot x\right|_{\pi/4}^{3\pi/4}=2\pi. $$
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