Calculus 10th Edition

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

Chapter 13 - Functions of Several Variables - 13.3 Exercises - Page 899: 124

Answer

TRUE.

Work Step by Step

If a cylindrical surface has rulings that are parallel to the y-axis, then the original function does not include any y variables. So the partial derivative to the y variable in this case (zero) would still be zero. So the statement is true.
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